derogation vs niggler

derogation and niggler both are nouns.

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

derogation (noun)	niggler (noun)
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law	someone who constantly criticizes in a petty way
a communication that belittles somebody or something