confederacy vs confederation

confederacy and confederation both are nouns.

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

As nouns, confederacy and confederation are synonyms defined as:

Other synonyms of confederacy include federation.

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