hollo vs vociferation

hollo and vociferation both are nouns.

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

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

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

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

hollo (verb)	vociferation (verb)
utter a sudden loud cry
cry hollo
encourage somebody by crying hollo