confederation vs confederacy

confederation and confederacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
confederation	Yes	No	No	No
confederacy	Yes	No	No	No

As nouns, confederation and confederacy are synonyms defined as:

Other synonyms of confederation include federation.

confederation (noun)	confederacy (noun)
the act of forming an alliance or confederation	a secret agreement between two or more people to perform an unlawful act
a union of political organizations	a union of political organizations
the state of being allied or confederated	a group of conspirators banded together to achieve some harmful or illegal purpose