POW! is an acronym for Prisoner of War, which is a term used to describe a person who is held captive by an enemy during a war. The crossword solutions for POW! are WHAMMO (6 letters), WHAM (4 letters), BANG (4 letters), BAM (3 letters), SOCK (4 letters), BLAM (4 letters), and INTERNEE (8 letters). These words are all onomatopoeic terms that are used to describe a loud sound, such as an explosion or a punch. They can also be used to express surprise or excitement.