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)

此の辺[konohen] this area
の辺に[noatarini] on the shores of
磯辺[isobe] seashore
一辺倒[ippentou] complete devotion to one side
右辺[uhen] right side

浦辺[urabe] seacoast
海辺[umibe] beach
岸辺[kishibe] shore
近辺[kinpen] neighbourhood
五辺形[gohenkei] pentagon