How to say "blade" in Japanese

• 葉はJLPT N4approx.Common
  nounCovers 'blade' only in the botanical sense: the flat blade of a grass. Outside that it just means 'leaf' (or a pine needle, frond), never the blade of a knife or sword.
  こちらには大おおきなハスの葉はがあります。↗

  We have very big lotus leaves.
• 剣けんCommon
  nounPrimarily 'sword', especially a large, double-edged one. Its 'blade' sense is therefore the blade of a sword; for knives or grass you need a different word.
  剣けんを取とる者ものは皆みな剣けんで滅ほろびる。↗

  All who take up the sword will perish by the sword.
• 葉っぱはっぱCommon
  nounLike 葉, this covers 'blade' only as a blade of grass; it is above all a common word for a leaf, and never means the blade of a knife or sword.
  私には葉はっぱとりんごしかありません。↗

  I have only leaves and apples.
• 刃はJLPT N1approx.Common
  nounPoints to the cutting edge of a knife or sword; its 'blade' sense is likewise the blade of such an implement, never a blade of grass.
  私のナイフの刃はは、とても鋭するどい。↗

  My knife has such a fine edge.
• ブレードCommon
  nounThe borrowed English word, matching 'blade' directly. Typical where the English term itself is kept — technical and product contexts, for instance — but it will not serve for a blade of grass.

Split 'blade' by sense: 葉 and 「葉っぱ」 mean a blade of grass (or a leaf), 刃 is the cutting edge of a knife or sword, 剣 is really 'sword', and 「ブレード」 is the loanword for 'blade' itself.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 葉はleaf
• 剣けんsword (esp. a large, double-edged one)
• 葉っぱはっぱleaf
• 刃はedge (of a knife or sword)
• ブレードblade
• 一刀いっとうsword
• 刃やいばblade
• 腕木うでぎcrossarm
• 葉身ようしんlamina
• 殺人刀さつじんとう(killing) sword
• 羽はねblade (of a fan, propeller, etc.)
• 鋭えいsharp weapon
• 中身なかみ(sword) blade
• 身みmain part