As nouns the difference between confraternity and confederacy
is that
confraternity is a group of people with a common interest while
confederacy is an alliance.
As a proper noun Confederacy is
the informal name for the
Confederate States of America, the collection of American states that seceded from the United States in 1861, and fought against the Union in the American Civil War.
confraternity
English
Noun
(confraternities)
A group of people with a common interest.
A fraternity or brotherhood.
confederacy
English
Alternative forms
*
Noun
(confederacies)
an alliance