bellyache vs bitch

bellyache and bitch both are nouns.

Word	Noun	Adjective	Verb	Adverb
bellyache	Yes	No	Yes	No
bitch	Yes	No	Yes	No

As verbs, bellyache and bitch are synonyms defined as:

Other synonyms of bellyache include beef, crab, gripe, grouse, holler, squawk.

bellyache (noun)	bitch (noun)
an ache localized in the stomach or abdominal region	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

bellyache (verb)	bitch (verb)
complain	say mean things
	complain