delegation vs delegacy

delegation and delegacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
delegation	Yes	No	No	No
delegacy	Yes	No	No	No

As nouns, delegation and delegacy are synonyms defined as:

Other synonyms of delegation include commission, deputation, mission.

delegation (noun)	delegacy (noun)
authorizing subordinates to make certain decisions	the appointment of a delegate
a group of representatives or delegates	a group of representatives or delegates
	the state of serving as an official and authorized delegate or agent