niggler vs derogation

niggler and derogation both are nouns.

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

niggler (noun)	derogation (noun)
someone who constantly criticizes in a petty way	(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