urethra vs epithelial duct

urethra and epithelial duct both are nouns.

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

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

urethra: duct through which urine is discharged in most mammals and which serves as the male genital duct
epithelial duct: a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance

Other hypernyms of urethra include canal, channel, duct.

urethra (noun)	epithelial duct (noun)
duct through which urine is discharged in most mammals and which serves as the male genital duct	a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance