冊子【さっし】
book, booklet, story book, pamphlet, notebook
別冊【べっさつ】
separate volume, extra issue, supplement, additional volume, supplementary volume
短冊【たんざく】
tanzaku, long, narrow strip of paper on which Japanese poems are written (vertically), thin rectangle
分冊【ぶんさつ】
separate volume, fascicle, fascicule