Confederate States vs Confederacy

Confederate States and Confederacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Confederate States	Yes	No	No	No
Confederacy	Yes	No	No	No

As nouns, Confederate States and Confederacy are synonyms defined as:

Confederate States and Confederacy: the southern states that seceded from the United States in 1861

Other synonyms of Confederate States include Confederate States of America, Dixie, Dixieland, South.

Confederate States (noun)	Confederacy (noun)
the southern states that seceded from the United States in 1861	the southern states that seceded from the United States in 1861