• 水みず — water
• 海水かいすい — seawater
• 雨水あまみず — rainwater
• 洪水こうずい — flood
• 流水りゅうすい — flowing water
• 湖水こすい — lake water

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The character “水” is a pictograph of flowing water. It represents rivers, liquids, and the essence of water in both nature and everyday life. It’s also the element for Wednesday in the Japanese calendar.