chamber vs guestroom

chamber and guestroom both are nouns.

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

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

chamber (noun)	guestroom (noun)
a natural or artificial enclosed space	a bedroom that is kept for the use of guests
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)	guestroom (verb)
place in a chamber