tailpipe vs pipage

tailpipe and pipage both are nouns.

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

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

tailpipe: a pipe carrying fumes from the muffler to the rear of a car
pipage: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of tailpipe include pipe, piping.

tailpipe (noun)	pipage (noun)
a pipe carrying fumes from the muffler to the rear of a car	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