hollo vs hollering

hollo and hollering both are nouns.

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

As nouns, hollo and hollering are synonyms defined as:

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

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

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

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