御猪口[ochoko] small cup
片口鰯[katakuchiiwashi] Japanese anchovy (Engraulis japonica)
白口[shiroguchi] white croaker (Pennahia argentata)
悪たれ口[akutareguchi] abuse
悪口雑言[akkouzougon] all kinds of malicious gossip

異口同音[ikudouon] in concert
異口同音に[ikudouonni] in one voice
ひと口[hitokuchi] mouthful
一口商い[hitokuchiakinai] an immediate definite deal
一口同音[ikkudouon] reading in unison

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