derogation vs pesky

derogation is a noun but pesky is not a noun.

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

derogation (noun)	pesky (noun)
(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

derogation (adjective)	pesky (adjective)
	causing irritation or annoyance