maligner vs disparagement

maligner and disparagement both are nouns.

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

maligner (noun)	disparagement (noun)
one who attacks the reputation of another by slander or libel	the act of speaking contemptuously of
	a communication that belittles somebody or something