pestilential vs pestilence

pestilential is not a noun while pestilence is a noun.

Word	Noun	Adjective	Verb	Adverb
pestilential	No	Yes	No	No
pestilence	Yes	No	No	No

pestilential (noun)	pestilence (noun)
	a pernicious and malign influence that is hard to get rid of
	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

pestilential (adjective)	pestilence (adjective)
likely to spread and cause an epidemic disease