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

斬る[kiru] to kill (a human) using a blade (sword, machete, knife, etc.)
斬新[zanshin] novel
人斬り[hitokiri] assassination
斬刻む[kirikizamu] to hew
斬り込む[kirikomu] to cut into

斬り殺す[kirikorosu] to slay
斬り散らす[kirichirasu] to cut down all
斬り死に[kirijini] fighting to the death (with swords)
斬り倒す[kiritaosu] to cut down
斬り破る[kiriyaburu] to cut to pieces

馬酔木[asebi] Japanese andromeda (Pieris japonica)
馬鈴薯[jagaimo] potato (Solanum tuberosum)
じゃじゃ馬[jajauma] restive horse
玖馬[kyuuba] Cuba
トロイの木馬[toroinomokuba] Trojan horse

巴奈馬[panama] Panama
馬克[maruku] mark
羅馬字[roomaji] Latin alphabet
ワープロ馬鹿[waapurobaka] someone whose kanji-writing ability has suffered due to overreliance on the kana-to-kanji conversion systems used to input Japanese text on a computer
愛馬[aiba] favourite horse