derogation vs libeler

derogation and libeler both are nouns.

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

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