priority vs anteriority

priority and anteriority both are nouns.

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

As nouns, priority and anteriority are synonyms defined as:

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

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