Peor, Mount Peor, Baal Peor

Definition:

The terms "Peor" and "Mount Peor" refer to a mountain located northeast of the Salt Sea, in the region of Moab.

The name "Beth Peor" was the name of a city, probably located on that mountain or near it. This was where Moses died after God showed him the Promised Land.
"Baal Peor" was a false god of the Moabites that they worshiped at Mount Peor. The Israelites also started worshiping this idol and God punished them for it.