sad sack vs depreciation

sad sack and depreciation both are nouns.

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

sad sack (noun)	depreciation (noun)
someone who makes mistakes because of incompetence	a decrease in price or value
	a communication that belittles somebody or something
	decrease in value of an asset due to obsolescence or use