hollering vs hollo

hollering and hollo both are nouns.

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

As nouns, hollering and hollo are synonyms defined as:

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

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

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

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