defamer vs slanderer

defamer and slanderer both are nouns.

Word	Noun	Adjective	Verb	Adverb
defamer	Yes	No	No	No
slanderer	Yes	No	No	No

As nouns, defamer and slanderer are synonyms defined as:

defamer and slanderer: one who attacks the reputation of another by slander or libel

Other synonyms of defamer include backbiter, libeler, maligner, traducer, vilifier.

defamer (noun)	slanderer (noun)
one who attacks the reputation of another by slander or libel	one who attacks the reputation of another by slander or libel