priority vs antecedence

priority and antecedence both are nouns.

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

As nouns, priority and antecedence are synonyms defined as:

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

priority (noun)	antecedence (noun)
preceding in time	preceding in time
status established in order of importance or urgency