chamber vs fireroom

chamber and fireroom both are nouns.

Word	Noun	Adjective	Verb	Adverb
chamber	Yes	No	Yes	No
fireroom	Yes	No	No	No

As nouns, fireroom is a hyponym of chamber; that is, fireroom is a word with a more specific, narrower meaning than chamber:

chamber: a natural or artificial enclosed space
fireroom: (nautical) chamber or compartment in which the furnaces of a ship are stoked or fired

chamber (noun)	fireroom (noun)
a natural or artificial enclosed space	(nautical) chamber or compartment in which the furnaces of a ship are stoked or fired
a room used primarily for sleeping
a room where a judge transacts business
an enclosed volume in the body
a deliberative or legislative or administrative or judicial assembly

chamber (verb)	fireroom (verb)
place in a chamber