prisoner of war camp vs POW camp

prisoner of war camp and POW camp both are nouns.

Word	Noun	Adjective	Verb	Adverb
prisoner of war camp	Yes	No	No	No
POW camp	Yes	No	No	No

As nouns, prisoner of war camp and POW camp are synonyms defined as:

Other synonyms of prisoner of war camp include internment camp, prison camp.

prisoner of war camp (noun)	POW camp (noun)
a camp for prisoners of war	a camp for prisoners of war