unpardonable vs mortal

unpardonable is not a noun while mortal is a noun.

Word	Noun	Adjective	Verb	Adverb
unpardonable	No	Yes	No	No
mortal	Yes	Yes	No	No

unpardonable (noun)	mortal (noun)
	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

unpardonable (adjective)	mortal (adjective)
not admitting of pardon	subject to death
	unrelenting and deadly
	involving loss of divine grace or spiritual death
	causing or capable of causing death