洪 こう Meanings Noun Hungary See also: ハンガリー. Kanji 洪 flood. Read as コウ. Words containing 洪 洪水 (こうずい) flood 大洪水 (だいこうずい) heavy flooding 洪水吐 (こうずいばき) spillway (esp. for floodwater management) And 8 more. Jinuma: Japanese Dictionary · Word lists