insulator

insulator - noun

a material such as glass or porcelain with negligible electrical or thermal conductivity

insulator - thesaurus

Scrabble score = 9

Please note that scrabble only allows seven tiles to be placed at once.

"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