antecedence vs priority

antecedence and priority both are nouns.

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

As nouns, antecedence and priority are synonyms defined as:

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

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