slanderer vs libeler

slanderer and libeler both are nouns.

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

As nouns, slanderer and libeler are synonyms defined as:

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

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

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