holler vs shout

holler and shout both are nouns.

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

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

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

As verbs, holler and shout are synonyms defined as:

Other synonyms of holler include call, cry, hollo, scream, shout out, squall, yell.

As verbs, shout is a hypernym of holler; that is, shout is a word with a broader meaning than holler:

holler: shout out
shout: utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)

holler (noun)	shout (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)	shout (verb)
complain	utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)
utter a sudden loud cry	utter a sudden loud cry
shout out	utter aloud; often with surprise, horror, or joy
	use foul or abusive language towards