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

覗う[ukagau] to peep (through)
覗き[nozoki] peeping
覗き見[nozokimi] peeking
覗きこむ[nozokikomu] to look into
覗く[nozoku] to peek (though a keyhole, gap, etc.)

覗魔[nozokima] peeping tom
管の穴から天を覗く[kudanoanakaratenwonozoku] Have a narrow view of things
覗眼鏡[nozokimegane] peep show
覗機関[nozokikarakuri] peep show
差覗く[sashinozoku] to peek