cerebral aqueduct vs duct

cerebral aqueduct and duct both are nouns.

Word	Noun	Adjective	Verb	Adverb
cerebral aqueduct	Yes	No	No	No
duct	Yes	No	No	No

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

cerebral aqueduct: a canal connecting the third and fourth ventricles
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of cerebral aqueduct include canal, channel, epithelial duct.

cerebral aqueduct (noun)	duct (noun)
a canal connecting the third and fourth ventricles	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