5 words for FSS 1–3 letters

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1 letter (2)

f s
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2 letters (2)

fs ss
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3 letters (1)

sfs
Boast – black bird
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C
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R
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O
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W
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
CWRO
Hint 3 another clue
Ridicule
24 +1