anteriority vs precedency

anteriority and precedency both are nouns.

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

As nouns, anteriority and precedency are synonyms defined as:

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

anteriority (noun)	precedency (noun)
the quality of being in front or (in lower animals) toward the head	the act of preceding in time or order or rank (as in a ceremony)
preceding in time	preceding in time
	status established in order of importance or urgency