roaring vs roar

roaring and roar both are nouns.

Word	Noun	Adjective	Verb	Adverb
roaring	Yes	Yes	No	Yes
roar	Yes	No	Yes	No

As nouns, roaring and roar are synonyms defined as:

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

As nouns, roaring and roar are synonyms defined as:

Other synonyms of roaring include boom, thunder.

roaring (noun)	roar (noun)
a very loud utterance (like the sound of an animal)	a very loud utterance (like the sound of an animal)
a deep prolonged loud noise	a deep prolonged loud noise
	the sound made by a lion

roaring (adjective)	roar (adjective)
very lively and profitable

roaring (verb)	roar (verb)
	laugh unrestrainedly and heartily
	make a loud noise, as of wind, water, or vehicles
	emit long loud cries
	utter words loudly and forcefully
	make a loud noise, as of animal
	act or proceed in a riotous, turbulent, or disorderly way

roaring (adverb)	roar (adverb)
extremely