discharge pipe vs pipage

discharge pipe and pipage both are nouns.

Word	Noun	Adjective	Verb	Adverb
discharge pipe	Yes	No	No	No
pipage	Yes	No	No	No

As nouns, pipage is a hypernym of discharge pipe; that is, pipage is a word with a broader meaning than discharge pipe:

discharge pipe: a pipe through which fluids can be discharged
pipage: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of discharge pipe include pipe, piping.

discharge pipe (noun)	pipage (noun)
a pipe through which fluids can be discharged	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	a fee charged for the use of pipes