• 回復かいふく — recovery
• 復習ふくしゅう — review; revision
• 復活ふっかつ — resurrection; revival
• 復旧ふっきゅう — restoration
• 復元ふくげん — reproduction; restoration
• 復帰ふっき — return; reinstatement
• 報復ほうふく — retaliation
• 反復はんぷく — repetition

The radical 彳 indicates action or steps, and the phonetic 复 contributes the sound. Together, 復 conveys “to return” or “to do again,” used for repetition, recovery, and restoration.