けつの穴[ketsunoana] anus
横穴[yokoana] cave
下穴[shitaana] pilot hole
穴だらけにする[anadarakenisuru] to fuck

穴凹[anaboko] hole
穴あけ器[anaakeki] (hole) punch
穴居[kekkyo] cave dwelling
穴居人[kekkyojin] cave dweller

一念発起[ichinenhokki] being resolved to (do something)
引き起す[hikiokosu] to cause
縁起[engi] omen
喚起[kanki] arousal
起きる[okiru] to get up

起上る[okiagaru] to rise
起す[okosu] to raise
起こり得る[okoriuru] to be possible to occur
起る[okoru] to occur
起つ[tatsu] to rise up