exhaust system vs exhaust manifold

exhaust system and exhaust manifold both are nouns.

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

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