salivary duct vs duct

salivary duct and duct both are nouns.

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

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

salivary duct: a duct through which saliva passes from the salivary gland into the mouth
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

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

salivary duct (noun)	duct (noun)
a duct through which saliva passes from the salivary gland into the mouth	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