• 囚人しゅうじん — prisoner; inmate
• 捕囚ほしゅう — captive; prisoner of war
• 囚われるとらわれる — to be confined; to be held captive

※ 囚 is rarely used alone and appears almost exclusively in compound words.

The kanji 囚 shows a person 人 enclosed within a boundary 囗. The image clearly conveys the idea of someone confined, captured, or imprisoned.