まっ四角[masshikaku] square
一天四海[ittenshikai] the world
下四半期[shimoshihanki] last quarter (of the year)
弦楽四重奏曲[gengakushijuusoukyoku] string quartet
再三再四[saisansaishi] repeatedly

三寒四温[sankanshion] alternation of three cold and four warm days
四つ[yottsu] four
四つんばい[yotsunbai] (crawl) on all fours
四つ角[yotsukado] four corners
四つ足[yotsuashi] four-footed (animal)

浪曼[roman] romance (i.e. Arthurian romances)
曼珠沙華[manjushage] red spider lily
曼陀羅[mandara] mandala
胎蔵界曼荼羅[taizoukaimandara] Garbhadhatu Mandala
両界曼荼羅[ryoukaimandara] Mandala of the Two Realms

金剛界曼荼羅[kongoukaimandara] Vajradhatu Mandala
四曼[shiman] four types of mandala (in Shingon)
四種曼荼羅[shishumandara] four types of mandala (in Shingon)
胎蔵曼荼羅[taizoumandara] Garbhadhatu Mandala