precedency vs precedence

precedency and precedence both are nouns.

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

As nouns, precedency and precedence are synonyms defined as:

precedency and precedence: the act of preceding in time or order or rank (as in a ceremony)

Other synonyms of precedency include precession.

As nouns, precedency and precedence are synonyms defined as:

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

As nouns, precedency and precedence are synonyms defined as:

precedency and precedence: status established in order of importance or urgency

Other synonyms of precedency include priority.

precedency (noun)	precedence (noun)
the act of preceding in time or order or rank (as in a ceremony)	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	status established in order of importance or urgency