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

尸諌[shikan] admonishing (one's master) at the cost of one's life
尸位素餐[shiisosan] neglecting the duties of an office while taking pay
尸冠[shikabanekanmuri] kanji "corpse" radical

三尸[sanshi] the three worms (in Taoism, worms that inhabit the human gut and, on the eve of the 57th day of the sexagenary cycle, ascend to heaven during one's sleep to report on one's wrongdoings)
尸童[yorimashi] child or doll used as a vessel for a spirit invoked by a shaman or miko