lymphatic vessel vs duct

lymphatic vessel and duct both are nouns.

Word	Noun	Adjective	Verb	Adverb
lymphatic vessel	Yes	No	No	No
duct	Yes	No	No	No

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

lymphatic vessel: a vascular duct that carries lymph which is eventually added to the venous blood circulation
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of lymphatic vessel include canal, channel, epithelial duct.

lymphatic vessel (noun)	duct (noun)
a vascular duct that carries lymph which is eventually added to the venous blood circulation	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