Confederate Army vs army

Confederate Army and army both are nouns.

Word	Noun	Adjective	Verb	Adverb
Confederate Army	Yes	No	No	No
army	Yes	No	No	No

As nouns, army is a hypernym of Confederate Army; that is, army is a word with a broader meaning than Confederate Army:

Confederate Army: the southern army during the American Civil War
army: a permanent organization of the military land forces of a nation or state

Other hypernyms of Confederate Army include ground forces, regular army, gray, grey.

Confederate Army (noun)	army (noun)
the southern army during the American Civil War	a permanent organization of the military land forces of a nation or state
	a large number of people united for some specific purpose