bile duct vs epithelial duct

bile duct and epithelial duct both are nouns.

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

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

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

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

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