knocker

knocker - noun

(Yiddish) a big shot who knows it and acts that way; a boastful immoderate person

a person who knocks (as seeking to gain admittance)

one who disparages or belittles the worth of something

a device (usually metal and ornamental) attached by a hinge to a door

knocker - thesaurus

Scrabble score = 17

"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