日本刀【にほんとう】
Japanese sword (usu. single-edged and curved), Japanese bladed weapon
刀剣【とうけん】
sword, dagger, knife, bayonet
竹刀【しない】
bamboo sword (for kendo), bamboo fencing stick
太刀【たち】
long sword (esp. the tachi, worn on the hip edge down by samurai), large sword, straight single-edged Japanese sword (from the mid-Heian period or earlier), guandao, Chinese glaive
小刀【こがたな】
(small) knife, short sword, small sword
短刀【たんとう】
short sword, knife, dagger, dirk, tantō