sinkhole

sinkhole - noun

a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof

sinkhole - thesaurus

Scrabble score = 15

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