一刀[ittou] sword
一刀彫り[ittoubori] one-knife carving
一刀両断[ittouryoudan] cutting in two with a single stroke
印刀[intou] seal-engraving knife
円刃刀[enjintou] round-edged scalpel

快刀[kaitou] (literary) sharp sword
快刀乱麻[kaitouranma] solving a problem swiftly and skillfully
懐刀[futokorogatana] confidant
儀刀[gitou] ceremonial sword
軍刀[guntou] saber

卍字[manji] swastika (esp. a counterclockwise swastika as a Buddhist symbol)
卍巴[manjitomoe] falling in swirls

卍刀[mantou] ninja weapon disguised as a pair of garden shears