disparagement vs grumbler

disparagement and grumbler both are nouns.

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

disparagement (noun)	grumbler (noun)
the act of speaking contemptuously of	a person given to excessive complaints and crying and whining
a communication that belittles somebody or something