| bloodsucker | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: hirudinean, leech |
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| cocksucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
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| (noun) a person who performs fellatio | - |
| goatsucker | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: caprimulgid, nightjar |
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| honeysucker | (noun) Australasian bird with tongue and bill adapted for extracting nectar | Synonyms: honey eater |
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| honeysuckle | (noun) shrub or vine of the genus Lonicera | - |
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| (noun) columbine of eastern North America having long-spurred red flowers | Synonyms: Aquilegia canadensis, meeting house |
| (noun) shrubby tree with silky foliage and spikes of cylindrical yellow nectarous flowers | Synonyms: Australian honeysuckle, Banksia integrifolia, coast banksia |
| lumpsucker | (noun) any of several very small lumpfishes | - |
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| sapsucker | (noun) small American woodpecker that feeds on sap from e.g. apple and maple trees | - |
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| seersucker | (noun) a light puckered fabric (usually striped) | - |
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| sharksucker | (noun) remoras found attached to sharks | Synonyms: Echeneis naucrates |
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| suck | (noun) the act of sucking | Synonyms: sucking, suction |
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| sucker | (noun) mostly North American freshwater fishes with a thick-lipped mouth for feeding by suction; related to carps | - |
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| (noun) an organ specialized for sucking nourishment or for adhering to objects by suction | - |
| (noun) hard candy on a stick | Synonyms: all-day sucker, lollipop |
| (noun) flesh of any of numerous North American food fishes with toothless jaws | - |
| (noun) a drinker who sucks (as at a nipple or through a straw) | - |
| (noun) a person who is gullible and easy to take advantage of | Synonyms: chump, fall guy, fool, gull, mark, mug, patsy, soft touch |
| (noun) a shoot arising from a plant's roots | - |
| suckerfish | (noun) marine fishes with a flattened elongated body and a sucking disk on the head for attaching to large fish or moving objects | Synonyms: remora, sucking fish |
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| sucking | (noun) the act of sucking | Synonyms: suck, suction |
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| suckling | (noun) feeding an infant by giving suck at the breast | Synonyms: lactation |
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| (noun) a young mammal that has not been weaned | - |
| (noun) an infant considered in relation to its nurse | Synonyms: nurseling, nursling |
| whalesucker | (noun) large blue Pacific remora that attaches to whales and dolphins | Synonyms: Remilegia australis, whale sucker |
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