muffler

muffler - noun

a tubular acoustic device inserted in the exhaust system that is designed to reduce noise

a scarf worn around the neck

a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations

muffler - thesaurus

Scrabble score = 15

"I ran the trial with a small group of students over three weeks before the summer holidays," she says. "I quickly saw the benefits, and signed up."

King's Leadership Academy, Warrington