screamer vs roarer

screamer and roarer both are nouns.

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

As nouns, screamer and roarer are synonyms defined as:

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

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

screamer (noun)	roarer (noun)
a very hard hit ball	someone who communicates vocally in a very loud voice
gooselike aquatic bird of South America having a harsh trumpeting call
a sensational newspaper headline
someone who communicates vocally in a very loud voice