hollo vs bellow

hollo and bellow both are nouns.

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

As nouns, hollo and bellow are synonyms defined as:

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

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

hollo (verb)	bellow (verb)
utter a sudden loud cry	shout loudly and without restraint
cry hollo	make a loud noise, as of animal
encourage somebody by crying hollo