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

剣を抜く[tsurugiwonuku] to draw a sword
剣客[kenkaku] fencer
剣玉[kendama] Japanese bilboquet (cup-and-ball game)
剣形[kengata] sword shape
剣劇[kengeki] sword play

剣戟[kengeki] weapons
剣豪[kengou] master fencer
剣山[kenzan] needle-point holder (in ikebana)
剣士[kenshi] swordsman