holler vs outcry

holler and outcry both are nouns.

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

As nouns, outcry is a hypernym of holler; that is, outcry is a word with a broader meaning than holler:

Other hypernyms of holler include call, cry, shout, vociferation, yell.

holler (noun)	outcry (noun)
a very loud utterance (like the sound of an animal)	a loud utterance; often in protest or opposition
a small valley between mountains

holler (verb)	outcry (verb)
complain	utter aloud; often with surprise, horror, or joy
utter a sudden loud cry	shout louder than
shout out