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

薙ぎ倒す[nagitaosu] to mow down
薙鉈[naginata] halberd
神薙ぎ[kannagi] medium
薙ぎ払う[nagiharau] to mow down
薙刀術[naginatajutsu] art of using a naginata (halberd)

薙ぐ[nagu] to mow down
水薙鳥[mizunagidori] petrel (esp. petrels of family Procellariidae)
大水薙鳥[oomizunagidori] streaked shearwater (species of seabird, Calonectris leucomelas)
草薙剣[kusanaginotsurugi] Kusanagi no Tsurugi (alternate name for Ama-no-Murakumo no Tsurugi; the sword of the Imperial regalia)