catalyst

catalyst - noun

(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

something that causes an important event to happen

catalyst - thesaurus

Scrabble score = 13

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