backbiter vs defamer

backbiter and defamer both are nouns.

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

As nouns, backbiter and defamer are synonyms defined as:

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

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

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