exhaust system vs muffler

exhaust system and muffler both are nouns.

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

exhaust system (noun)	muffler (noun)
system consisting of the parts of an engine through which burned gases or steam are discharged	a scarf worn around the neck
	a tubular acoustic device inserted in the exhaust system that is designed to reduce noise
	a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations