screecher vs roarer

screecher and roarer both are nouns.

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

As nouns, screecher and roarer are synonyms defined as:

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

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

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