blade
[C] Countable
pl: blades
The word evokes a sense of precision and narrowness. It describes an object where the thinness of the profile is essential to its function, whether that function is slicing through a material or slicing through the air to create lift or propulsion. While a knife is the whole tool, the blade is specifically the cutting edge. This distinction is often used in technical or forensic contexts to isolate the functional part of the instrument from the handle or hilt.
Used for distinct physical objects like a knife edge, a propeller part, or a single piece of grass.