muffler vs dash-pot

muffler and dash-pot both are nouns.

Word	Noun	Adjective	Verb	Adverb
muffler	Yes	No	No	No
dash-pot	Yes	No	No	No

As nouns, dash-pot is a hyponym of muffler; that is, dash-pot is a word with a more specific, narrower meaning than muffler:

muffler: a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations
dash-pot: a mechanical damper; the vibrating part is attached to a piston that moves in a chamber filled with liquid

Other hyponyms of muffler include damper block, piano damper, cushion, shock, shock absorber.

muffler (noun)	dash-pot (noun)
a scarf worn around the neck	a mechanical damper; the vibrating part is attached to a piston that moves in a chamber filled with liquid
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