tubing vs conduit

tubing and conduit both are nouns.

Word	Noun	Adjective	Verb	Adverb
tubing	Yes	No	No	No
conduit	Yes	No	No	No

As nouns, conduit is a hypernym of tubing; that is, conduit is a word with a broader meaning than tubing:

tubing: conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases
conduit: a passage (a pipe or tunnel) through which water or electric wires can pass

tubing (noun)	conduit (noun)
conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases	a passage (a pipe or tunnel) through which water or electric wires can pass