capillary tube vs tubing

capillary tube and tubing both are nouns.

Word	Noun	Adjective	Verb	Adverb
capillary tube	Yes	No	No	No
tubing	Yes	No	No	No

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

capillary tube: a tube of small internal diameter; holds liquid by capillary action
tubing: conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases

Other hypernyms of capillary tube include tube.

capillary tube (noun)	tubing (noun)
a tube of small internal diameter; holds liquid by capillary action	conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases