snake in the grass vs derogation

snake in the grass and derogation both are nouns.

Word	Noun	Adjective	Verb	Adverb
snake in the grass	Yes	No	No	No
derogation	Yes	No	No	No

snake in the grass (noun)	derogation (noun)
a deceitful or treacherous person	(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