disparagement vs meritless

disparagement is a noun but meritless is not a noun.

Word	Noun	Adjective	Verb	Adverb
disparagement	Yes	No	No	No
meritless	No	Yes	No	No

disparagement (noun)	meritless (noun)
the act of speaking contemptuously of
a communication that belittles somebody or something

disparagement (adjective)	meritless (adjective)
	without merit; of little or no value or use