exhaust pipe vs piping

exhaust pipe and piping both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhaust pipe	Yes	No	No	No
piping	Yes	No	No	Yes

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

exhaust pipe: a pipe through which burned gases travel from the exhaust manifold to the muffler
piping: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of exhaust pipe include pipage, pipe.

exhaust pipe (noun)	piping (noun)
a pipe through which burned gases travel from the exhaust manifold to the muffler	playing a pipe or the bagpipes
	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	a thin strip of covered cord used to edge hems

exhaust pipe (adverb)	piping (adverb)
	(used of heat) extremely