large person vs mortal

large person and mortal both are nouns.

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

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

large person: a person of greater than average size
mortal: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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

large person (noun)	mortal (noun)
a person of greater than average size	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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