hollering vs vociferation

hollering and vociferation both are nouns.

Word	Noun	Adjective	Verb	Adverb
hollering	Yes	No	No	No
vociferation	Yes	No	No	No

As nouns, vociferation is a hypernym of hollering; that is, vociferation is a word with a broader meaning than hollering:

Other hypernyms of hollering include call, cry, outcry, shout, yell.

hollering (noun)	vociferation (noun)
a very loud utterance (like the sound of an animal)	a loud utterance; often in protest or opposition