4 words for CEIT 1-letter words

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1 letter (4)

c e i t
Boast – black bird
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Hint 1 meaning
A bird, usually black, of the genus Corvus, having a strong conical beak, with projecting bristles. It has a harsh, croaking note. See Caw.
Hint 2 anagram
OWRC
Hint 3 another clue
Ridicule
16 +1