How to read: こうこう
Pronunciation: 
Same names and idioms in reading:
哮々 耕好 鏗鏗 恰々 鉱坑
Names and idioms with total stroke of 18:
二親 阿翁 倖奈 豪斗 九野本
Names and idioms similar to 洪荒:
洪福 洪皓 荒猪 荒沸 洪牙利
Yojijukugo(idioms with 4 Kanji characters) including 洪荒:
荒亡之行 備荒貯蓄 無稽荒唐