waste pipe vs pipage

waste pipe and pipage both are nouns.

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

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

waste pipe: a pipe through which liquid is carried away
pipage: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of waste pipe include pipe, piping.

waste pipe (noun)	pipage (noun)
a pipe through which liquid is carried away	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