common bile duct vs duct

common bile duct and duct both are nouns.

Word	Noun	Adjective	Verb	Adverb
common bile duct	Yes	No	No	No
duct	Yes	No	No	No

As nouns, duct is a hypernym of common bile duct; that is, duct is a word with a broader meaning than common bile duct:

common bile duct: a duct formed by the hepatic and cystic ducts; opens into the duodenum
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of common bile duct include canal, channel, epithelial duct.

common bile duct (noun)	duct (noun)
a duct formed by the hepatic and cystic ducts; opens into the duodenum	an enclosed conduit for a fluid
	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
	a continuous tube formed by a row of elongated cells lacking intervening end walls