depreciation vs killjoy

depreciation and killjoy both are nouns.

Word	Noun	Adjective	Verb	Adverb
depreciation	Yes	No	No	No
killjoy	Yes	No	No	No

depreciation (noun)	killjoy (noun)
a decrease in price or value	someone who spoils the pleasure of others
a communication that belittles somebody or something
decrease in value of an asset due to obsolescence or use