steam chest vs steam engine

steam chest and steam engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
steam chest	Yes	No	No	No
steam engine	Yes	No	No	No

steam chest (noun)	steam engine (noun)
the chamber from which steam is distributed to a cylinder	external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder