fireroom vs chamber

fireroom and chamber both are nouns.

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

As nouns, chamber is a hypernym of fireroom; that is, chamber is a word with a broader meaning than fireroom:

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

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

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