Army of the Confederacy vs Confederate Army

Army of the Confederacy and Confederate Army both are nouns.

Word	Noun	Adjective	Verb	Adverb
Army of the Confederacy	Yes	No	No	No
Confederate Army	Yes	No	No	No

As nouns, Army of the Confederacy and Confederate Army are synonyms defined as:

Army of the Confederacy and Confederate Army: the southern army during the American Civil War

Army of the Confederacy (noun)	Confederate Army (noun)
the southern army during the American Civil War	the southern army during the American Civil War