bellyache vs holler

bellyache and holler both are nouns.

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

As verbs, bellyache and holler are synonyms defined as:

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

bellyache (noun)	holler (noun)
an ache localized in the stomach or abdominal region	a very loud utterance (like the sound of an animal)
	a small valley between mountains