derogation vs grumbler

derogation and grumbler both are nouns.

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

derogation (noun)	grumbler (noun)
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law	a person given to excessive complaints and crying and whining
a communication that belittles somebody or something