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

街角[machikado] street corner
街区[gaiku] block (of land)
街娼[gaishou] prostitute
街図[gaizu] street map
街燈[gaitou] street light

街頭[gaitou] in the street
街道[kaidou] highway (esp. one existing from the Edo period)
街路[gairo] road
街路アドレス[gairoadoresu] street address