earthborn vs mortal

earthborn is not a noun while mortal is a noun.

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

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

earthborn (adjective)	mortal (adjective)
connected with earthly life; of earthly origin	subject to death
springing from or born on the earth	unrelenting and deadly
of earthly origin (as mortals are)	involving loss of divine grace or spiritual death
	causing or capable of causing death