sad sack vs disparagement

sad sack and disparagement both are nouns.

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

sad sack (noun)	disparagement (noun)
someone who makes mistakes because of incompetence	the act of speaking contemptuously of
	a communication that belittles somebody or something