thin person vs mortal

thin person and mortal both are nouns.

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

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

thin person: a person who is unusually thin and scrawny
mortal: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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

thin person (noun)	mortal (noun)
a person who is unusually thin and scrawny	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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