cylinder vs stalactite

cylinder and stalactite both are nouns.

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

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

cylinder: a surface generated by rotating a parallel line around a fixed line
stalactite: a cylinder of calcium carbonate hanging from the roof of a limestone cave

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

cylinder (noun)	stalactite (noun)
a cylindrical container for oxygen or compressed air	a cylinder of calcium carbonate hanging from the roof of a limestone cave
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)