| cuckoo | (noun) any of numerous European and North American birds having pointed wings and a long tail | - |
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| (noun) a man who is a stupid incompetent fool | Synonyms: bozo, fathead, goof, goofball, goose, jackass, twat, zany |
| (verb) repeat monotonously, like a cuckoo repeats his call | - |
| cuckooflower | (noun) a bitter cress of Europe and America | Synonyms: Cardamine pratensis, cuckoo flower, lady's smock, meadow cress |
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| cuckoopint | (noun) common European arum with lanceolate spathe and short purple spadix; emerges in early spring; source of a starch called arum | Synonyms: Arum maculatum, jack-in-the-pulpit, lords-and-ladies |
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| koodoo | (noun) either of two spiral-horned antelopes of the African bush | Synonyms: koudou, kudu |
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| kook | (noun) someone regarded as eccentric or crazy and standing out from a group | Synonyms: odd fellow, odd fish, odd man out, queer bird, queer duck |
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| kookaburra | (noun) Australian kingfisher having a loud cackling cry | Synonyms: Dacelo gigas, laughing jackass |
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| kookie | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| kooky | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
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| turakoo | (noun) large brightly crested bird of Africa | Synonyms: touraco, turaco, turacou |
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