precedency vs precedent

precedency and precedent both are nouns.

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

precedency (noun)	precedent (noun)
the act of preceding in time or order or rank (as in a ceremony)	an example that is used to justify similar occurrences at a later time
preceding in time	(civil law) a law established by following earlier judicial decisions
status established in order of importance or urgency	a subject mentioned earlier (preceding in time)
	a system of jurisprudence based on judicial precedents rather than statutory laws

precedency (adjective)	precedent (adjective)
	preceding in time, order, or significance