umbilical vs duct

umbilical and duct both are nouns.

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

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

umbilical: membranous duct connecting the fetus with the placenta
duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of umbilical include canal, channel, epithelial duct, funiculus, fetal membrane.

umbilical (noun)	duct (noun)
membranous duct connecting the fetus with the placenta	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

umbilical (adjective)	duct (adjective)
relating to or resembling the umbilicus