roarer vs roar

roarer and roar both are nouns.

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

roarer (noun)	roar (noun)
someone who communicates vocally in a very loud voice	a very loud utterance (like the sound of an animal)
	a deep prolonged loud noise
	the sound made by a lion

roarer (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