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

圧痕[akkon] impression
血痕[kekkon] bloodstain
痕跡[konseki] trace
瘡痕[soukon] scar
弾痕[dankon] bullet hole

爪痕[tsumeato] fingernail mark
刀痕[toukon] sword scar
痘痕面[abatazura] pockmarked face
墨痕[bokkon] ink marks