muffler

noun

1. (US)Something or someone that muffles.

   “Holonym: exhaust system”

2. Something or someone that muffles.
3. Something or someone that muffles.

   “The newcomer took off his cap and his big woollen muffler. His nose was pointed and red.”

   “He was wearing a maroon cashmere muffler which had hiked up on his neck, giving him next to no protection against the cold. Abruptly, and rather absently, he took his right hand out of his coat pocket and started to adjust the muffler, but before it was adjusted, he changed his mind […]”

4. (World-War-I, rare, slang)Something or someone that muffles.