vas deferens vs duct

vas deferens and duct both are nouns.

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

As nouns, duct is a hypernym of vas deferens; that is, 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
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, epithelial duct.

vas deferens (noun)	duct (noun)
a duct that carries spermatozoa from the epididymis to the ejaculatory duct	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