bellowing vs bellow

bellowing and bellow both are nouns.

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

As nouns, bellowing and bellow are synonyms defined as:

bellowing and bellow: a very loud utterance (like the sound of an animal)

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

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

bellowing (verb)	bellow (verb)
	shout loudly and without restraint
	make a loud noise, as of animal