vas deferens vs epithelial duct

vas deferens and epithelial duct both are nouns.

Word	Noun	Adjective	Verb	Adverb
vas deferens	Yes	No	No	No
epithelial duct	Yes	No	No	No

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

vas deferens: a duct that carries spermatozoa from the epididymis to the ejaculatory duct
epithelial duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of vas deferens include canal, channel, duct.

vas deferens (noun)	epithelial duct (noun)
a duct that carries spermatozoa from the epididymis to the ejaculatory duct	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance