gas line vs pipage

gas line and pipage both are nouns.

Word	Noun	Adjective	Verb	Adverb
gas line	Yes	No	No	No
pipage	Yes	No	No	No

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

gas line: a pipe that carries gasoline from a tank to a gasoline engine
pipage: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of gas line include pipe, piping.

gas line (noun)	pipage (noun)
a pipeline used to transport natural gas	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
a pipe that carries gasoline from a tank to a gasoline engine	a fee charged for the use of pipes
a queue of vehicles waiting to purchase gasoline