inlet manifold vs gasoline engine

inlet manifold and gasoline engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
inlet manifold	Yes	No	No	No
gasoline engine	Yes	No	No	No

inlet manifold (noun)	gasoline engine (noun)
manifold that carries vaporized fuel from the carburetor to the inlet valves of the cylinders	an internal-combustion engine that burns gasoline; most automobiles are driven by gasoline engines