exhaust manifold vs exhaust system

exhaust manifold and exhaust system both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhaust manifold	Yes	No	No	No
exhaust system	Yes	No	No	No

exhaust manifold (noun)	exhaust system (noun)
a manifold that receives exhaust gases from the cylinders and conducts them to the exhaust pipe	system consisting of the parts of an engine through which burned gases or steam are discharged