hollering vs holloa

hollering and holloa both are nouns.

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

As nouns, hollering and holloa are synonyms defined as:

hollering and holloa: a very loud utterance (like the sound of an animal)

Other synonyms of hollering include bellow, bellowing, holla, holler, hollo, roar, roaring, yowl.

hollering (noun)	holloa (noun)
a very loud utterance (like the sound of an animal)	a very loud utterance (like the sound of an animal)