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)

本の[honno] mere
異本[ihon] different edition
一坪本社[hitotsubohonsha] small company headquarters located in Tokyo simply for name value
一本[ippon] one long cylindrical thing
一本気[ippongi] single-minded (esp. personality or person)

一本橋[ipponbashi] (a) log bridge
一本建て[ippondate] (a) single standard
一本松[ipponmatsu] solitary pine tree
一本杉[ipponsugi] (a) solitary cryptomeria tree
一本槍[ipponyari] guiding principle

丸柱[marubashira] column
火柱[hibashira] pillar of fire
蚊柱[kabashira] mosquito swarm
貝柱[kaibashira] adductor muscle
巻柱[makibashira] gold-covered woodwork at a temple in Hiraizumi

魂柱[konchuu] sound post (violin, etc.)
支柱[shichuu] prop
斜角柱[shakakuchuu] oblique prism
人柱[hitobashira] human pillar
水銀柱[suiginchuu] column of mercury