御三時[osanji] three-o'clock snack
三鞭酒[shanpen] champagne
球面三角法[kyuumensankakuhou] spherical trigonometry
胸三寸[munesanzun] heart
元三[ganzan] New Year's period (January 1st to 3rd)

五十三次[gojuusantsugi] the 53 Toukaidou stages
向こう三軒[mukousangen] one's next three neighbors
降三世明王[gouzanzemyouou] Trailokyavijaya Vidya-raja
再三[saisan] again and again
再三再四[saisansaishi] repeatedly

芥箱[gomibako] garbage can
げた箱[getabako] shoe rack (in genkan)
化粧箱[keshoubako] vanity case
救急箱[kyuukyuubako] first-aid kit
仕事箱[shigotobako] workbox

私書箱[shishobako] post office box
慈善箱[jizenbako] charity box
主の箱[shunohako] Ark of the Lord
手箱[tebako] (small) box to keep valuables, etc.
重箱[juubako] multi-tiered food box