disparagement vs pest

disparagement and pest both are nouns.

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

disparagement (noun)	pest (noun)
the act of speaking contemptuously of	any unwanted and destructive insect or other animal that attacks food or crops or livestock etc.
a communication that belittles somebody or something	a persistently annoying person
	any epidemic disease with a high death rate
	a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal