What's the difference between sheading and shoading?

Sheading

Definition:

• (v. t.) A tithing, or division, in the Isle of Man, in which there is a coroner, or chief constable. The island is divided into six sheadings.

Example Sentences:

• (1) Thames Valley Police assistant chief constable Chris Shead defended the force's use of the weapon.

Shoading

Definition:

• (n.) The tracing of veins of metal by shoads.

Example Sentences: