Enter a word, phrase, description, or pattern above to find synonyms, related words, and more.
Concept clusters in the subject Biology (Top)
ART Abortion Adolescent development Aeronautics Agnosia Agricultural science Alternative medicine Alternative medicine (2) Alternative medicine (3) Anaerobic respiration Anaesthesia Ancient writing on papyrus Anorexia nervosa Anthropology Anthropology (2) Anthropology (3) Anthropomorphism Aquaculture Arctic region Asexual reproduction Autotrophs Autotrophy and heterotrophy Benthos Bio- Bio- as a prefix Bio-chemistry Bioanthropology Bioengineering Bioengineering (2) Bioengineering (3) Biogeography Biological engineering Biological mutation Biologically active substance Biology Biometrics Bioprocessing Biosimilars Biotechnology Biotechnology (2) Biotechnology (3) Body and its parts Bumpy CAM Calcium carbonate Cellular biology Cellular biology (2) Chemical tropism Chemotaxis Chromosome sets Chronobiology Classifying organisms Cloning Cure-all Darwinian evolution Death or dying Development of form Different sizes of plankton Earth geography Earth science Earthly Eating a plant-based diet Ecology Ecology (2) Ecology (3) Econometrics Endemicity Energy transfer Epidemiology Estrous cycle Eugenics Evolution Evolution (2) Evolutionary biology Evolutionary biology (2) Evolutionary biology (3) Evolutionary change Expert Expert (2) Extremophiles Feeding Female womb Fetal development Fetus Fever-causing agents Field study Flower farming Flowering plant reproduction Fœtal Gelatinous substances Gender and sex Genesis Genetic Genetic (2) Genetic evolution Genetic mutation Genetics Genetics (2) Genetics (3) Genetics (4) Genetics (5) Genetics (6) Genetics (7) Genomics Genomics (2) Genomics (3) Geography Geologic eras Geologic time scale Geriatrics Giving birth to a baby Glacial Impacts Gynecology Habitat Having one of something Having only one element Having two parts or lobes Hemiplegia Heterogeneity Heterotrophic metabolism Homeopathy Homology Human-world relations Humanocentrism Humans and their behavior Hygiene Igneous rocks Injection Insect ecology Karyotyping Kinetics Labor and delivery Lake or body of water Lake stratification Living with COVID's impact Location/direction Looks-based judgement Macro and micro Macrosystems Manual therapy Massage therapy Measuring physical properties Measuring the size Meat-eating Medical Medical diagnosis Medicinal agents Medicine Mental health Mental illness Metabolic pathways Metamorphic rocks Microscopic aquatic organisms Microscopic organisms Microscopic organisms (2) Midwifery Mind-body connection Mineralogy Monomorphy Morphogenesis Morphological change Morphology Movement Movement (2) Muscle tone Mycology Neurological disability Neurological dyskinesia Neurological dyskinesia (2) Neurology Neuronal cell interactions Neuroscience Neuroscience (2) Neurotoxicity Nourishing the body OEI Obstetrics Olfaction Order Ore-bearing Organismal form & structure Organismal study Organisms Organology Origin of species Orthopedic anesthesia Orthopedics Pain relief Paleontologist Paleontology Paleontology (2) Parasitism Parity Pathology Patterning Pediatrician Periprocedural care Pharmacology Pharmacology (2) Pharmacology (3) Phylogenetic classification Phylogenetics Physic or physick Physics Physiology Phytochemistry Phytohormones Plankton ecology Plant life forms Plant morphology Plant responses to stimuli Plant sexuality Plants and plant life Ploidy Podiatry Polymorphism Porosity Post-event/period occurrence Post-event/procedure Postnatal Pre-pregnancy and childbirth Premature birth Prescribing medication Providing therapeutic services Psychiatry Psychological trauma Psychology as a profession Psychology as a science Puberty Pus Pus (2) Reducing carbon emissions Reproductive strategies Rhythm in biology Rock types Rock types (2) Rocks and minerals Root Saprotrophs Sedimentary rock layers Seed dispersal Seismology Seizures Selective breeding Self-organization Sensory experience Sensory receptors Septate Sexual reproduction Sexual reproduction (2) Sexual reproduction (3) Sexual reproduction (4) Shape description Shape of leaves Shape or form Shapes Smell disorders Soil classification Soil or dirt Soil science Soil types Specialist doctor Speciation Spread of a pandemic Stillborn Stimulus response Stone Age Human Development Structural geology Structural geology (2) Study and use of drugs Study of animals Study of living organisms Study of trace fossils Studying ancient life forms Studying ancient life forms (2) Studying animals Studying animals (2) Studying fish Studying metabolism Studying microorganisms Studying plants Studying plants (2) Studying the Earth's past Studying the environment Studying the fossil record Studying the fossil record (2) Studying the past Studying the properties Sub/trans procedures Sustainable agriculture Symbiosis Symmetry Symptomology Taxonomy Taxonomy (2) Taxonomy (3) Tectonics Temporal-spatial analysis Time and space in geography Traditional medicine Transition into menopause Treating health issues Trees and their care Trophic level Trophic level (2) Tropism Tropism (2) Typing in microbiology Unknown Variation Virginity and the hymen Volcanic activity Volcanism Volcanology Water in the body Woman's menstrual cycle Wonder drug or miracle drug Xenology Xenotransplantation Xeriscaping Zoology Zoology (2) Zoology (3) Zoology (4) Zoonotic diseases Zygosity

This subject index is an experimental OneLook feature. We've grouped words and phrases into thousands of clusters based on a statistical analysis of how they are used in writing. Some of the words and concepts may be vulgar or offensive. The names of the clusters were written automatically and may not precisely describe every word within them.

How do I use OneLook's thesaurus / reverse dictionary?

OneLook lets you find any kind of word for any kind of writing. Like a traditional thesaurus, you can use it to find synonyms and antonyms, but it's far more flexible. Describe what you're looking for with a single word, a few words, or even a whole sentence. Type in your description and hit Enter (or select a word that shows up in the autocomplete preview) to see the related words. You can order, filter, and explore the words that come back in a variety of creative ways. Here's a video which goes over some of the basics.

What are some examples?

Example searches
🔆 Find a word by describing it barrel maker
before the flood
museum guide
search for food
urge to travel
what a milliner makes
tried twice for the same crime
when cancer spreads through the body
🔆 Explore synonyms and related concepts fancy
industrial revolution
🔆 Get a list of words in some category ("type of...") type of bird of prey
type of soft cheese
type of light bulb
🔆 Find more words similar to some examples (comma-separated list) squishy,spongy,gooey
ice cream,pie,cookies
🔆 Answer basic identification questions capital of Vietnam
longest river in the world
original host of Jeopardy
🔆 Solve crossword puzzle clues, or find words if you only know some of the letters.
(Use pattern:description syntax)
??lon:synthetic fabric
c*:board game

Exploring the results

Click on any result to see definitions and usage examples tailored to your search, as well as links to follow-up searches and additional usage information when available. OneLook knows about more than 2 million different words and expressions covering every topic under the sun. Try exploring a favorite topic for a while and you'll be surprised how much new stuff there is to learn!

Ordering the results

Your results will initially appear with the most closely related word shown first, the second-most closely shown second, and so on. You can re-order the results in a variety of different ways, including alphabetically, by length, by popularity, by modernness, by formality, and by other aspects of style. Click the box that says "Closest meaning first..." to see them all. (Here's a short video about sorting and filtering with OneLook Thesaurus.)

Filtering the results

You can refine your search by clicking on the "Advanced filters" button on the results page. This lets you narrow down your results to match a certain starting letter, number of letters, number of syllables, related concept, meter, vowel sound, or number of syllables. Read more details on filters if you're interested in how they work.

I'm only looking for synonyms! What's with all of these weird results?

For some kinds of searches only the first result or the first few results are truly synonyms or good substitutions for your search word. We highlight these results in yellow. Beyond that, the results are meant to inspire you to consider similar words and adjacent concepts. Not all of the results will make sense at first, but they're all connected with your search in some way. We'd rather give you too many options than too few. If you're unsure of a word, we urge you to click on it to check its definitions and usage examples before using it in your Oscars acceptance speech or honors thesis.

What are letter patterns?

If you know some letters in the word you're looking for, you can enter a pattern instead of, or in addition to, a description. Here are how patterns work:
  • The asterisk (*) matches any number of letters. That means that you can use it as a placeholder for any part of a word or phrase. For example, if you enter blueb* you'll get all the terms that start with "blueb"; if you enter *bird you'll get all the terms that end with "bird"; if you enter *lueb* you'll get all the terms that contain the sequence "lueb", and so forth. An asterisk can match zero letters, too.
  • The question mark (?) matches exactly one letter. That means that you can use it as a placeholder for a single letter or symbol. The query l?b?n?n,  for example, will find the word "Lebanon".

  • The number-sign (#) matches any English consonant. For example, the query tra#t finds the word "tract" but not "trait".

  • The at-sign (@) matches any English vowel (including "y"). For example, the query abo@t finds the word "about" but not "abort".

  • NEW! The comma (,) lets you combine multiple patterns into one. For example, the query ?????,*y* finds 5-letter words that contain a "y" somewhere, such as "happy" and "rhyme".

  • NEW! Use double-slashes (//) before a group of letters to unscramble them (that is, find anagrams.) For example, the query //soulbeat will find "absolute" and "bales out", and re//teeprsn will find "represent" and "repenters". You can use another double-slash to end the group and put letters you're sure of to the right of it. For example, the query //blabrcs//e will find "scrabble". Question marks can signify unknown letters as usual; for example, //we??? returns 5-letter words that contain a W and an E, such as "water" and "awake".

  • NEW! A minus sign (-) followed by some letters at the end of a pattern means "exclude these letters". For example, the query sp???-ei finds 5-letter words that start with "sp" but do not contain an "e"or an "i", such as "spoon" and "spray".

  • NEW! A plus sign (+) followed by some letters at the end of a pattern means "restrict to these letters". For example, the query *+ban finds "banana".

  • On OneLook's main search or directly on OneLook Thesaurus, you can combine patterns and thesaurus lookups by putting a colon (:) after a pattern and then typing a description of the word, as in ??lon:synthetic fabric and the other examples above.

Other ways to access this service:

Is this available in any language other than English?

The same interface is now available in Spanish at OneLook Tesauro as a beta version. More languages are coming!

How does it work?

We use a souped-up version of our own Datamuse API, which in turn uses several lingustic resources described in the "Data sources" section on that page. The definitions come from Wiktionary, Wikipedia, and WordNet. Here are some known problems with the current system.
Much gratitude to Gultchin et al for the algorithm behind the "Most funny-sounding" sort order.

Profanity and problematic word associations

If you're using this site with children, be forewarned you'll find profanity and other vulgar expressions if you use OneLook frequently. (We take an unflinching look at how words have actually been used; scrubbing out hurtful wordswould be a disservice to everyone.)

Some of the thesaurus results come from a statistical analysis of the words in a large collection of books written in the past two centuries. A handful of times we've found that this analysis can lead us to suggest word associations that reflect racist or harmful stereotypes present in this source material. If you see one of these, please know that we do not endorse what the word association implies. In egregious cases we will remove it from the site if you report it to us via the feedback link below.


No personally identifying information is ever collected on this site or by any add-ons or apps associated with OneLook. OneLook Thesaurus sends your search query securely to the Datamuse API, which keeps a log file of the queries made to the service in the last 24 hours. The log file is deleted after 24 hours and we do not retain any long-term information about your IP address or invididual queries.

Who's behind this site and where can I send my comments and complaints feedback?

OneLook is a service of Datamuse. You can send us feedback here.

The sunburst logo (🔆) is the emoji symbol for "high brightness", which we aspire to create with OneLook. (The graphic came from the open-source Twemoji project.)

Watch a video overview of OneLook Thesaurus