libeler vs derogation

libeler and derogation both are nouns.

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

libeler (noun)	derogation (noun)
one who attacks the reputation of another by slander or libel	(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law
	a communication that belittles somebody or something