standpipe vs pipage

standpipe and pipage both are nouns.

Word	Noun	Adjective	Verb	Adverb
standpipe	Yes	No	No	No
pipage	Yes	No	No	No

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

standpipe: a vertical pipe
pipage: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of standpipe include pipe, piping.

standpipe (noun)	pipage (noun)
a vertical pipe	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