Furnace and Hob

Furnace noun - An enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc..

Hob and furnace are semantically related In some cases you can use "Hob" instead a noun "Furnace".

Hob noun - Playful, reckless behavior that is not intended to cause serious harm.

Furnace and hob are semantically related in hearth for burning wood topic. You can use "Furnace" instead a noun "Hob".