firing chamber vs chamber

firing chamber and chamber both are nouns.

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

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

firing chamber (noun)	chamber (noun)
chamber that is the part of a gun that receives the charge	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

firing chamber (verb)	chamber (verb)
	place in a chamber