anteriority vs priority

anteriority and priority both are nouns.

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

As nouns, anteriority and priority are synonyms defined as:

Other synonyms of anteriority include antecedence, antecedency, precedence, precedency.

anteriority (noun)	priority (noun)
the quality of being in front or (in lower animals) toward the head	preceding in time
preceding in time	status established in order of importance or urgency