deceased person vs mortal

deceased person and mortal both are nouns.

Word	Noun	Adjective	Verb	Adverb
deceased person	Yes	No	No	No
mortal	Yes	Yes	No	No

As nouns, mortal is a hypernym of deceased person; that is, mortal is a word with a broader meaning than deceased person:

deceased person: someone who is no longer alive
mortal: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of deceased person include individual, person, somebody, someone, soul.

deceased person (noun)	mortal (noun)
someone who is no longer alive	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

deceased person (adjective)	mortal (adjective)
	subject to death
	unrelenting and deadly
	involving loss of divine grace or spiritual death
	causing or capable of causing death