roarer vs bawler

roarer and bawler both are nouns.

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

As nouns, roarer and bawler are synonyms defined as:

roarer and bawler: someone who communicates vocally in a very loud voice

Other synonyms of roarer include bellower, screamer, screecher, shouter, yeller.

roarer (noun)	bawler (noun)
someone who communicates vocally in a very loud voice	someone who communicates vocally in a very loud voice
	a loud weeper