坑口[koukou] pithead
坑道[koudou] tunnel
坑内[kounai] within a pit or (mine) shaft
坑内事故[kounaijiko] mine accident
入坑[nyuukou] entrance into drift or pit

廃坑[haikou] abandoned mine
金坑[kinkou] gold mine
坑夫[koufu] miner
炭坑[tankou] coal mine
銀坑[ginkou] silver mine

垂迹[suijaku] temporary manifestation by a buddha (in order to save people)
筆迹[hisseki] handwriting
真迹[shinseki] true autograph

事迹[jiseki] evidence
本地垂迹説[honjisuijakusetsu] manifestation theory (holding that Shinto gods are manifestations of buddhas)
迹門[shakumon] first half of the Lotus Sutra, in which the Buddha appears as a spatiotemporally restricted being