cylinder vs tube

cylinder and tube both are nouns.

Word	Noun	Adjective	Verb	Adverb
cylinder	Yes	No	No	No
tube	Yes	No	Yes	No

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

cylinder: a surface generated by rotating a parallel line around a fixed line
tube: a hollow cylindrical shape

Other hyponyms of cylinder include brake drum, drum, shank, shank, shank, stem, stalactite, stalagmite, barrel, drum, pipe.

cylinder (noun)	tube (noun)
a cylindrical container for oxygen or compressed air	conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
a chamber within which piston moves	an electric railway operating below the surface of the ground (usually in a city)
a surface generated by rotating a parallel line around a fixed line	electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
a solid bounded by a cylindrical surface and two parallel planes (the bases)	(anatomy) any hollow cylindrical body structure
	a hollow cylindrical shape

cylinder (verb)	tube (verb)
	place or enclose in a tube
	convey in a tube
	ride or float on an inflated tube
	provide with a tube or insert a tube into