剣奴 is read as けんど (kendo) and means gladiator.
けんど
kendo
けんどう
けん
bayonet
けんかく
master swordsman
けんげき
sword play
けんし
swordsman
けんごう
great swordsman
けんどうじょう
kendo hall
けんじゅつつかい
fencer
けんどうぎ
kendo gi
けんぽう
(art of) fencing
けんざん
needle-point holder (in ikebana)
つるぎのやま
mountain of swords