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

甘子[amago] land-locked variety of red-spotted masu trout (Oncorhynchus masou ishikawae)
甘い[amai] sweet
甘い小説[amaishousetsu] sentimental novel
甘え[amae] depending on other's kindness
甘えっ子[amaekko] spoilt child

甘える[amaeru] to behave like a spoiled child
甘く見る[amakumiru] to not take seriously
甘たるい[amatarui] sentimental
甘やかす[amayakasu] to pamper
甘栗[amaguri] broiled sweet chestnuts