bellyache vs beef

bellyache and beef both are nouns.

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

As verbs, bellyache and beef are synonyms defined as:

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

bellyache (noun)	beef (noun)
an ache localized in the stomach or abdominal region	cattle that are reared for their meat
	informal terms for objecting
	meat from an adult domestic bovine

bellyache (verb)	beef (verb)
complain	complain