derogation vs snake in the grass

derogation and snake in the grass both are nouns.

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

derogation (noun)	snake in the grass (noun)
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law	a deceitful or treacherous person
a communication that belittles somebody or something