chamber vs caisson

chamber and caisson both are nouns.

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

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

chamber (noun)	caisson (noun)
a natural or artificial enclosed space	large watertight chamber used for construction under water
a room used primarily for sleeping	an ornamental sunken panel in a ceiling or dome
a room where a judge transacts business	a chest to hold ammunition
an enclosed volume in the body	a two-wheeled military vehicle carrying artillery ammunition
a deliberative or legislative or administrative or judicial assembly

chamber (verb)	caisson (verb)
place in a chamber