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刃；锋
The blade of a knife, axe, or saw is the edge, which is used for cutting.
例句
Many of these tools have sharp blades, so be careful.
这些工具中很多都有锋利的刀片，务必小心。
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（螺旋桨的）叶片
The blades of a propeller are the long, flat parts that turn round.
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桨叶
The blade of an oar is the thin flat part that you put into the water.
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（草的）叶片
A blade of grass is a single piece of grass.