ureter vs epithelial duct

ureter and epithelial duct both are nouns.

Word	Noun	Adjective	Verb	Adverb
ureter	Yes	No	No	No
epithelial duct	Yes	No	No	No

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

ureter: either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder
epithelial duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of ureter include canal, channel, duct.

ureter (noun)	epithelial duct (noun)
either of a pair of thick-walled tubes that carry urine from the kidney to the urinary bladder	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance