| 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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| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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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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| dimout | (noun) darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft) | Synonyms: blackout, brownout |
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| 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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| 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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| 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 |
| 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 | - |
| 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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| mouton | (noun) meat from a mature domestic sheep | Synonyms: mutton |
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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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| vermouth | (noun) any of several white wines flavored with aromatic herbs; used as aperitifs or in mixed drinks | - |
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| wrymouth | (noun) eellike Atlantic bottom fish with large almost vertical mouth | Synonyms: Cryptacanthodes maculatus, ghostfish |
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