bellow vs bellowing

bellow and bellowing both are nouns.

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

As nouns, bellow and bellowing are synonyms defined as:

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

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

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

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