backbiter vs maligner

backbiter and maligner both are nouns.

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

As nouns, backbiter and maligner are synonyms defined as:

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

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

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