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

五稜郭[goryoukaku] five-sided fortification
五稜堡[goryouho] five-sided fort
三稜鏡[sanryoukyou] prism
山稜[sanryou] mountain ridge

稜線[ryousen] ridgeline
気骨稜稜[kikotsuryouryou] (a person with) strong moral fiber (backbone, determination)
三稜草[mikuri] branched bur-reed (Sparganium erectum)
稜角[ryoukaku] corner

草臥れる[kutabireru] to get tired
遺草[isou] posthumous works
一年草[ichinensou] annual (plant)
詠草[eisou] draft poem
下草[shitakusa] undergrowth

仮名草紙[kanazoushi] story in the kana
伽草子[togizoushi] fairy-tale book
海草[kaisou] marine plant
乾草[kansou] hay
甘草[kanzou] liquorice