libeler vs libel

libeler and libel both are nouns.

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

libeler (noun)	libel (noun)
one who attacks the reputation of another by slander or libel	a false and malicious publication printed for the purpose of defaming a living person
	the written statement of a plaintiff explaining the cause of action (the defamation) and any relief he seeks

libeler (verb)	libel (verb)
	print slanderous statements against