anterior vs anteriority

anterior and anteriority both are nouns.

Word	Noun	Adjective	Verb	Adverb
anterior	Yes	Yes	No	No
anteriority	Yes	No	No	No

anterior (noun)	anteriority (noun)
a tooth situated at the front of the mouth	the quality of being in front or (in lower animals) toward the head
	preceding in time

anterior (adjective)	anteriority (adjective)
of or near the head end or toward the front plane of a body
earlier in time