Find synonymsFind words that mean the same thing, drawn from WordNet's synonym sets. Narrow them by spelling, part of speech or syllable count to get a word that fits the sentence you already have. No API key required.
Find antonymsFind words that mean the opposite, per WordNet. No API key required.
Find rhymesFind perfect rhymes for a word, the ones that match from the stressed vowel to the end of the word. Combine with the syllable and part-of-speech filters to get a rhyme that scans and fits: two-syllable adjectives that rhyme with gold, say. No API key required.
Find near rhymesFind approximate rhymes: words that almost rhyme, which is what most song and verse actually uses. This is the action to reach for when a word has no perfect rhyme at all. No API key required.
Find homophonesFind words pronounced exactly the same but spelled differently: course and coarse, their and there. Useful for proofreading rules and for word games. No API key required.
Find consonant matchesFind words with the same consonants in the same order, whatever the vowels do: sample and simple, letter and litter. Poets call it consonance. No API key required.
Find associated wordsFind the words that turn up in the same writing as this one, what Datamuse calls triggers. Cow brings back milking, dairy and udder. Good for brainstorming, tagging and keyword expansion, where a thesaurus is too narrow. No API key required.
Find adjectives that describe a nounFind the adjectives writers actually use for a noun, ranked by how often they appear together in Google Books: beach gives sandy, rocky, deserted. Add a topic hint to skew them, e.g. ocean with the topic "temperature". No API key required.
Find nouns an adjective describesThe mirror of finding adjectives for a noun: give an adjective and get the nouns it is usually attached to. Yellow gives fever, ribbon and journalism. No API key required.
Find what a word is a kind ofMove up a level: find the broader category a word belongs to, per WordNet. A gondola is a kind of boat, a sparrow a kind of bird. No API key required.
Find kinds of a wordMove down a level: find the specific things a general word covers, per WordNet. Boat gives gondola, ferry and dinghy. No API key required.
Find the parts of somethingFind what something is made of, per WordNet: a car comprises an accelerator, a clutch and a bumper. No API key required.
Find what something is part ofThe mirror of finding the parts of something: give a part and get what it belongs to. A trunk is part of a tree. No API key required.
Find words that follow a wordFind the words that most often come straight after this one in print, per Google Books: wreak is followed by havoc. The way to finish a collocation you have half of. No API key required.
Find words that come before a wordFind the words that most often come straight before this one in print, per Google Books: havoc is preceded by wreak. No API key required.
Find words with a similar meaningThe reverse dictionary: describe the thing and get the word for it. "Ringing in the ears" comes back as tinnitus. Give it a single word instead and it works as a broad thesaurus, wider than the strict synonym sets. No API key required.
Find words that sound like thisFind real words that sound like something written down phonetically: "jirraf" comes back as giraffe. This is the action for a word someone heard but cannot spell, and for cleaning up speech-to-text. No API key required.
Find words by spelling patternFind words matching a spelling pattern: t??k gives task, trek and tack; *ology gives every -ology. Wildcards are * for any run of letters, ? for exactly one, # for any consonant and @ for any vowel. Solves crossword clues and checks spellings. Pass a plain word with no wildcards to get the words spelled most like it, which is a spell-check. No API key required.
Fill in the blankFind the words that fit a gap in a sentence, given the word on either side of it. "Wreak ___" gives havoc and vengeance. Results are ranked by how often each word really does appear in that position in print, so after a very common word the commonest answers come first - add a meaning or a spelling pattern to get to the words you are after. No API key required.
Find wordsThe full word search, with every constraint available at once: meaning, sound, spelling pattern, any of the fifteen lexical relations, and the words on either side of a blank. Set several and only the words satisfying all of them come back, five-letter synonyms of happy, or rhymes for blue that also mean sad. Use one of the dedicated actions when you want just one of these; use this one to combine them. No API key required.
Look up a wordEverything Datamuse knows about one word: its definitions, its parts of speech, how it is pronounced in both IPA and Arpabet, how many syllables it has and how often it appears in print. Also says whether the word is in the dictionary at all, which is how to check a spelling or vet a name. No API key required.
Suggest completions for a prefixAutocomplete a partly typed word. This is Datamuse's search-box backend: it spell-corrects as it goes and falls back to words that sound or mean something similar when nothing starts with what was typed, so "rawand" still reaches Rwanda. Suggestions are ranked by popularity. No API key required.