坑 こう Meanings Noun, Noun suffix pit (esp. of a mine) Kanji 坑 pit. Read as コウ. Words containing 坑 坑道 (こうどう) tunnel 坑口 (こうこう) pithead 立坑 (たてこう) shaft (e.g. in a mine) And 27 more. Jinuma: Japanese Dictionary · Word lists