wet blanket vs derogation

wet blanket and derogation both are nouns.

Word	Noun	Adjective	Verb	Adverb
wet blanket	Yes	No	No	No
derogation	Yes	No	No	No

wet blanket (noun)	derogation (noun)
someone who spoils the pleasure of others	(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