一枚岩[ichimaiiwa] monolith
火山岩[kazangan] volcanic rock
火成岩[kaseigan] igneous rock
かこう岩[kakougan] granite
岩塩[ganen] halite

岩屋[iwaya] cavern
岩角[iwakado] edge or corner of a stone
岩間[iwama] among rocks
岩山[iwayama] rocky mountain

奇巌[kigan] strangely shaped rocks
巌窟[gankutsu] cave
巌壁[ganpeki] wall of rock
巌々とした[gangantoshita] craggy
巌頭[gantou] top of a massive rock

巉巌[zangan] near-vertical cliff or peak
巌蔭[iwakage] shade of a rock
危巌[kigan] steep, towering rock
枯木寒巌[kobokukangan] withered trees and frozen rocks

鴉片窟[ahenkutsu] opium den
仙窟[senkutsu] enchanted cave
巣窟[soukutsu] den
洞窟[doukutsu] cave
貧民窟[hinminkutsu] slums

魔窟[makutsu] den of thieves
偏窟[henkutsu] eccentricity
理窟[rikutsu] theory
巌窟[gankutsu] cave