1 Old HSK word(s): ☊洪水 ** C
防洪* * 分洪* * 洪* * 排洪* * 山洪* * 泄洪* * 蓄洪* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

蓄 store, save, hoard, gather
洪 vast, immense / flood, deluge

Hsk Characters: 洪 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
洪 6D2A + 洪 + + vast, immense / flood, deluge 水, 氵 共 Water 共 (GEMEINSAM) hong2 +

Korean:

洪 + 洪 홍수 홍, 큰물 홍 (큰물 a big flood, an inundation) or 넓을 홍
1 NHSK word(s): 洪水* 6 hong2 shui3deluge/ flood
KOREAN6000 word(s):
0 KOREAN 2500 New HSK words):
0 KOREAN Sentence(s):