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

一曹[issou] master sergeant (JSDF)
１等軍曹[ittougunsou] sergeant first-class
軍曹[gunsou] sergeant
御曹子[onzoushi] son of a distinguished family
三曹[sansou] sergeant (JSDF)

３等軍曹[santougunsou] sergeant
児曹[jisou] children
重曹[juusou] baking soda
重炭酸曹達[juutansansouda] sodium bicarbonate
上級曹長[joukyuusouchou] sergeant major