mortal vs fatal

mortal is a noun but fatal is not a noun.

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

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

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