1.  silencer(n = noun.artifact) - short tube attached to the muzzle of a gun that deadens the sound of firing;
is a kind of tube, tubing
Derived form verb silence₁

2.  silencer(n = noun.artifact) muffler - a tubular acoustic device inserted in the exhaust system that is designed to reduce noise;
is a kind of acoustic device
is a part of exhaust, exhaust system
Derived form verb silence₁

   One that silences; [Webster 1913 Suppl.]

silencer, n. any of various devices for reducing the noise emitted by the exhaust of a motor vehicle, a gun, etc.

N  nonresonance, thud, thump, dead sound, nonresonance, muffled drums, cracked bell, damper, silencer, nonresonant, dead, dampened, muffled.