derogation vs pestiferous

derogation is a noun but pestiferous is not a noun.

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

derogation (noun)	pestiferous (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)	pestiferous (adjective)
	causing irritation or annoyance
	likely to spread and cause an epidemic disease
	tending to corrupt or pervert
	contaminated with infecting organisms