holler vs yell

holler and yell both are nouns.

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

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

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

As verbs, holler and yell are synonyms defined as:

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

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

holler (verb)	yell (verb)
complain	utter or declare in a very loud voice
utter a sudden loud cry	utter a sudden loud cry
shout out