chamber vs child's room

chamber and child's room both are nouns.

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

As nouns, child's room is a hyponym of chamber; that is, child's room is a word with a more specific, narrower meaning than chamber:

chamber (noun)	child's room (noun)
a natural or artificial enclosed space	a bedroom for a child
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)	child's room (verb)
place in a chamber