What's the difference between knurl and nurl?

Knurl

Definition:

• (n.) A contorted knot in wood; a crossgrained protuberance; a nodule; a boss or projection.
• (n.) One who, or that which, is crossgrained.
• (v. t.) To provide with ridges, to assist the grasp, as in the edge of a flat knob, or coin; to mill.

Example Sentences:

Nurl

Definition:

• (v. t.) To cut with reeding or fluting on the edge of, as coins, the heads of screws, etc.; to knurl.

Example Sentences: