tear duct vs duct

tear duct and duct both are nouns.

Word	Noun	Adjective	Verb	Adverb
tear duct	Yes	No	No	No
duct	Yes	No	No	No

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

tear duct: any of several small ducts that carry tears from the lacrimal glands
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of tear duct include canal, channel, epithelial duct.

tear duct (noun)	duct (noun)
any of several small ducts that carry tears from the lacrimal glands	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