prisoner of war
noun /ˌprɪznər əv ˈwɔː(r)/
  /ˌprɪznər əv ˈwɔːr/
 (plural prisoners of war)
 (abbreviation POW)
- a person, usually a member of the armed forces, who is captured by the enemy during a war and kept in a prison camp until the war has finished- After several more months as a prisoner of war, he escaped again.
- He was held as a prisoner of war.
 Oxford Collocations DictionaryPrisoner of war is used before these nouns:- camp