brown rat vs derogation

brown rat and derogation both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown rat	Yes	No	No	No
derogation	Yes	No	No	No

brown rat (noun)	derogation (noun)
common domestic rat; serious pest worldwide	(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