delegacy vs deputation

delegacy and deputation both are nouns.

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

As nouns, delegacy and deputation are synonyms defined as:

Other synonyms of delegacy include commission, delegation, mission.

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