child's room vs chamber

child's room and chamber both are nouns.

Word	Noun	Adjective	Verb	Adverb
child's room	Yes	No	No	No
chamber	Yes	No	Yes	No

As nouns, chamber is a hypernym of child's room; that is, chamber is a word with a broader meaning than child's room:

Other hypernyms of child's room include bedchamber, bedroom, sleeping accommodation, sleeping room.

child's room (noun)	chamber (noun)
a bedroom for a child	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

child's room (verb)	chamber (verb)
	place in a chamber