polish off vs derogation

polish off is not a noun while derogation is a noun.

Word	Noun	Adjective	Verb	Adverb
polish off	No	No	Yes	No
derogation	Yes	No	No	No

polish off (noun)	derogation (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

polish off (verb)	derogation (verb)
finish a task completely
finish eating all the food on one's plate or on the table
kill intentionally and with premeditation