Office: Though the Japanese word “jimusho” is also used, these days “office” is more common. Jimusho gives the impression of a small space. Company: Most Japanese know the word “company,” but generally use “kaisha.” Building: You often hear “gaisha,” in cases where the previous character influences its pronunciation. Though “building” is of course understood, the shortened word “biru” is used to refer to office blocks or blocks housing retail outlets.