| allmouth | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: angler, angler fish, anglerfish, goosefish, Lophius Americanus, lotte, monkfish |
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| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
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| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anacoluthic | (adjective) of or related to syntactic inconsistencies of the sort known as anacoluthons | - |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authentically | (adverb) genuinely; with authority | Synonyms: genuinely |
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| authenticate | (verb) establish the authenticity of something | - |
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| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| (verb) be the author of | - |
| authoress | (noun) a woman author | - |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authoritatively | (adverb) in an authoritative and magisterial manner | Synonyms: magisterially |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorize | (verb) grant authorization or clearance for | Synonyms: authorise, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorise, empower |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| authorship | (noun) the act of creating written works | Synonyms: composition, penning, writing |
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| (noun) the act of initiating a new idea or theory or writing | Synonyms: paternity |
| azimuth | (noun) the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian | Synonyms: AZ |
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| azimuthal | (adjective) of or relating to or in azimuth | - |
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| badmouth | (verb) speak unfavorably about | Synonyms: drag through the mud, malign, traduce |
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| bigmouthed | (adjective) unwisely talking too much | Synonyms: blabbermouthed, blabby, talkative |
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| bismuth | (noun) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals | Synonyms: atomic number 83, Bi |
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| bismuthal | (adjective) of or relating to bismuth | - |
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| bismuthic | (adjective) containing bismuth (especially in the pentavalent state) | - |
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| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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| blabbermouthed | (adjective) prone to communicate confidential information | Synonyms: leaky, talebearing, tattling |
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| (adjective) unwisely talking too much | Synonyms: bigmouthed, blabby, talkative |
| closemouthed | (adjective) inclined to secrecy or reticence about divulging information | Synonyms: close, closelipped, secretive, tightlipped |
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| coauthor | (noun) a writer who collaborates with others in writing something | Synonyms: joint author |
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| cottonmouth | (noun) venomous semiaquatic snake of swamps in southern United States | Synonyms: Agkistrodon piscivorus, cottonmouth moccasin, water moccasin |
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| couth | (adjective) (used facetiously) refined and well-mannered | - |
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| (noun) (used facetiously) refinement | - |
| couthie | (adjective) (chiefly Scottish) agreeable and genial | Synonyms: couthy |
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| couthy | (adjective) (chiefly Scottish) agreeable and genial | Synonyms: couthie |
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| drouth | (noun) a shortage of rainfall | Synonyms: drought |
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| (noun) a prolonged shortage | Synonyms: drought |
| druthers | (noun) the right or chance to choose | Synonyms: preference |
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| euthanasia | (noun) the act of killing someone painlessly (especially someone suffering from an incurable illness) | Synonyms: mercy killing |
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| euthanatise | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatize, euthanise, euthanize, mercy kill |
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| euthanatize | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanise, euthanize, mercy kill |
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| euthanise | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanatize, euthanize, mercy kill |
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| euthanize | (verb) intentionally cause the painless death of a person or animal | Synonyms: euthanatise, euthanatize, euthanise, mercy kill |
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| euthenics | (noun) the study of methods of improving human well-being and efficient functioning by improving environmental conditions | - |
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| eutherian | (adjective) of or relating to or belonging to the subclass Eutheria | - |
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| (noun) mammals having a placenta; all mammals except monotremes and marsupials | Synonyms: eutherian mammal, placental, placental mammal |
| frogmouth | (noun) insectivorous bird of Australia and southeastern Asia having a wide frog-like mouth | - |
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| goalmouth | (noun) (sports) the area immediately in front of the goal | - |
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| inauthentic | (adjective) false or fake; not what it appears to be | Synonyms: spurious, unauthentic |
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| largemouth | (noun) a large black bass; the angle of the jaw falls behind the eye | Synonyms: largemouth bass, largemouth black bass, largemouthed bass, largemouthed black bass, Micropterus salmoides |
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| loudmouth | (noun) a person who causes trouble by speaking indiscreetly | Synonyms: blusterer |
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| luthier | (noun) a craftsman who makes stringed instruments (as lutes or guitars or violins) | - |
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| mealymouthed | (adjective) hesitant to state facts or opinions simply and directly as from e.g. timidity or hypocrisy | Synonyms: mealy-mouthed |
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| motormouth | (noun) someone who talks incessantly | - |
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| mouth | (noun) the opening of a jar or bottle | - |
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| (noun) the externally visible part of the oral cavity on the face and the system of organs surrounding the opening | - |
| (noun) the opening through which food is taken in and vocalizations emerge | Synonyms: oral cavity, oral fissure, rima oris |
| (noun) an impudent or insolent rejoinder | Synonyms: back talk, backtalk, lip, sass, sassing |
| (noun) the point where a stream issues into a larger body of water | - |
| (noun) an opening that resembles a mouth (as of a cave or a gorge) | - |
| (noun) a person conceived as a consumer of food | - |
| (noun) a spokesperson (as a lawyer) | Synonyms: mouthpiece |
| (verb) express in speech | Synonyms: speak, talk, utter, verbalise, verbalize |
| (verb) articulate silently; form words with the lips only | - |
| (verb) touch with the mouth | - |
| mouthbreeder | (noun) any of various fishes that carry their eggs and their young in their mouths | - |
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| mouthful | (noun) a small amount eaten or drunk | Synonyms: taste |
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| (noun) the quantity that can be held in the mouth | - |
| mouthless | (adjective) having no mouth or mouthlike opening | Synonyms: astomatous |
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| mouthlike | (adjective) of an opening that resembles a mouth | - |
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| mouthpart | (noun) any part of the mouth of an insect or other arthropod especially one adapted to a specific way of feeding | - |
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| mouthpiece | (noun) the aperture of a wind instrument into which the player blows directly | Synonyms: embouchure |
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| (noun) the tube of a pipe or cigarette holder that a smoker holds in the mouth | - |
| (noun) an acoustic device; the part of a telephone into which a person speaks | - |
| (noun) (especially boxing) equipment that protects an athlete's mouth | Synonyms: gumshield |
| (noun) a part that goes over or into the mouth of a person | - |
| (noun) a spokesperson (as a lawyer) | Synonyms: mouth |
| mouthwash | (noun) a medicated solution used for gargling and rinsing the mouth | Synonyms: gargle |
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| nuthatch | (noun) any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects | Synonyms: nutcracker |
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| nuthouse | (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, sanatorium, snake pit |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| outhouse | (noun) a small outbuilding with a bench having holes through which a user can defecate | Synonyms: earth-closet, jakes, privy |
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| ruth | (noun) a feeling of sympathy and sorrow for the misfortunes of others | Synonyms: commiseration, pathos, pity |
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| ruthenium | (noun) a rare polyvalent metallic element of the platinum group; it is found associated with platinum | Synonyms: atomic number 44, Ru |
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| rutherford | (noun) a unit strength of a radioactive source equal to one million disintegrations per second | - |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| ruthful | (adjective) feeling or expressing pain or sorrow for sins or offenses | Synonyms: contrite, remorseful, rueful |
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| ruthfulness | (noun) a state of gloomy sorrow | Synonyms: mournfulness, sorrowfulness |
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| ruthless | (adjective) without mercy or pity | Synonyms: pitiless, remorseless, unpitying |
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| ruthlessly | (adverb) in a ruthless manner | - |
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| ruthlessness | (noun) mercilessness characterized by a lack of pity | Synonyms: pitilessness |
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| (noun) feelings of extreme heartlessness | Synonyms: cruelty, mercilessness, pitilessness |
| sleuth | (noun) a detective who follows a trail | Synonyms: sleuthhound |
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| (verb) watch, observe, or inquire secretly | Synonyms: snoop, spy, stag |
| sleuthhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: bloodhound |
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| (noun) a detective who follows a trail | Synonyms: sleuth |
| sleuthing | (noun) a police investigation to determine the perpetrator | Synonyms: detecting, detection, detective work |
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| smallmouth | (noun) a variety of black bass; the angle of the jaw falls below the eye | Synonyms: Micropterus dolomieu, smallmouth bass, smallmouth black bass, smallmouthed bass, smallmouthed black bass |
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| south | (adjective) situated in or facing or moving toward or coming from the south | - |
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| (noun) a location in the southern part of a country, region, or city | - |
| (noun) the cardinal compass point that is at 180 degrees | Synonyms: due south, S, southward |
| (noun) the direction corresponding to the southward cardinal compass point | - |
| (adverb) in a southern direction | Synonyms: in the south, to the south |
| southbound | (adjective) moving toward the south | Synonyms: southward |
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| southeast | (adjective) situated in or oriented toward the southeast | Synonyms: southeasterly, southeastern |
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| (adjective) coming from the southeast | Synonyms: southeasterly |
| (noun) a location in the southeastern part of a country, region, or city | - |
| (noun) the compass point midway between south and east; at 135 degrees | Synonyms: SE, sou'-east, southeastward |
| (noun) the direction corresponding to the southeastward compass point | - |
| (adverb) to, toward, or in the southeast | Synonyms: sou'-east, south-east |
| southeaster | (noun) a strong wind from the southeast | Synonyms: sou'easter |
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| southeasterly | (adjective) situated in or oriented toward the southeast | Synonyms: southeast, southeastern |
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| (adjective) coming from the southeast | Synonyms: southeast |
| southeastern | (adjective) of a region of the United States generally including Alabama; Georgia; Florida; Tennessee; South Carolina; North Carolina | - |
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| (adjective) situated in or oriented toward the southeast | Synonyms: southeast, southeasterly |
| southeastward | (adjective) toward the southeast | - |
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| (noun) the compass point midway between south and east; at 135 degrees | Synonyms: SE, sou'-east, southeast |
| (adverb) in a southeastward direction | Synonyms: southeastwardly |
| southeastwardly | (adverb) in a southeastward direction | Synonyms: southeastward |
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| souther | (noun) a wind from the south | Synonyms: south wind, southerly |
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| southerly | (adjective) from the south; used especially of wind | Synonyms: southern |
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| (adjective) situated in or oriented toward the south | Synonyms: southern |
| (noun) a wind from the south | Synonyms: south wind, souther |
| (adverb) from the south | - |
| (adverb) toward the south | Synonyms: southward, southwards |
| southern | (adjective) situated in or coming from regions of the south | - |
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| (adjective) in or characteristic of a region of the United States south of (approximately) the Mason-Dixon line | - |
| (adjective) from the south; used especially of wind | Synonyms: southerly |
| (adjective) situated in or oriented toward the south | Synonyms: southerly |