undesirable vs disparagement

undesirable and disparagement both are nouns.

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

undesirable (noun)	disparagement (noun)
one whose presence is undesirable	the act of speaking contemptuously of
	a communication that belittles somebody or something

undesirable (adjective)	disparagement (adjective)
not wanted
not worthy of being chosen (especially as a spouse)