piston chamber vs cylinder

piston chamber and cylinder both are nouns.

Word	Noun	Adjective	Verb	Adverb
piston chamber	Yes	No	No	No
cylinder	Yes	No	No	No

As nouns, piston chamber and cylinder are synonyms defined as:

piston chamber (noun)	cylinder (noun)
a chamber within which piston moves	a cylindrical container for oxygen or compressed air
	a chamber within which piston moves
	a surface generated by rotating a parallel line around a fixed line
	a solid bounded by a cylindrical surface and two parallel planes (the bases)