Hot-water bottle and Warming pan

Hot-water bottle noun - A stoppered receptacle (usually made of rubber) that is to be filled with hot water and used for warming a bed or parts of the body.

Warming pan and hot-water bottle are semantically related. In some cases you can use "Warming pan" instead a noun phrase "Hot-water bottle".

Warming pan noun - A long-handled covered pan holding live coals to warm a bed.

Hot-water bottle and warming pan are semantically related. You can use "Hot-water bottle" instead a noun phrase "Warming pan".