sad sack vs derogation

sad sack and derogation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sad sack	Yes	No	No	No
derogation	Yes	No	No	No

sad sack (noun)	derogation (noun)
someone who makes mistakes because of incompetence	(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