bronchiole vs duct

bronchiole and duct both are nouns.

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

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

bronchiole: any of the smallest bronchial ducts; ending in alveoli
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

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

bronchiole (noun)	duct (noun)
any of the smallest bronchial ducts; ending in alveoli	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