fatal vs mortal

fatal is not a noun while mortal is a noun.

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

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

fatal (adjective)	mortal (adjective)
bringing death	subject to death
having momentous consequences; of decisive importance	unrelenting and deadly
controlled or decreed by fate; predetermined	involving loss of divine grace or spiritual death
(of events) having extremely unfortunate or dire consequences; bringing ruin	causing or capable of causing death