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)

御邪魔します[ojamashimasu] excuse me for disturbing (interrupting) you
誤魔化し[gomakashi] hanky-panky
悪魔[akuma] devil
悪魔払い[akumabarai] exorcism
胡魔化す[gomakasu] to deceive

好事魔多し[koujimaooshi] Lights are usually followed by shadows
降魔術[koumajutsu] demon invocation
邪魔[jama] hindrance
邪魔者[jamamono] someone who is a nuisance or a burden
邪魔臭い[jamakusai] troublesome