bitch vs sound off

bitch is a noun but sound off is not a noun.

Word	Noun	Adjective	Verb	Adverb
bitch	Yes	No	Yes	No
sound off	No	No	Yes	No

As verbs, sound off is a hypernym of bitch; that is, sound off is a word with a broader meaning than bitch:

Other hypernyms of bitch include complain, kick, kvetch, plain, quetch.

As verbs, sound off is a hypernym of bitch; that is, sound off is a word with a broader meaning than bitch:

Other hypernyms of bitch include complain, kick, kvetch, plain, quetch.

bitch (noun)	sound off (noun)
female of any member of the dog family
informal terms for objecting
a person (usually but not necessarily a woman) who is thoroughly disliked
an unpleasant difficulty

bitch (verb)	sound off (verb)
say mean things	express complaints, discontent, displeasure, or unhappiness
complain	express one's opinion openly and without fear or hesitation
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