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

小滝[otaki] cascade
滝口[takiguchi] top of a waterfall
滝川[takigawa] rapids
滝つぼ[takitsubo] basin under a waterfall

滝登り[takinobori] (fish) climbing (swimming) up waterfall
白滝[shirataki] noodles made from konnyaku
雌滝[medaki] the smaller waterfall (of the two)
男滝[odaki] greater waterfall (of the two)