10 letters · 17 points in Scrabble
noun a person of subnormal intelligence
noun a child secretly exchanged for another in infancy
originThe noun is derived from change + -ling (suffix with the sense ‘immature; small’). Sense 6 (“idiot, simpleton”) is from the idea that foolish children had been left by magical creatures (sense 1). The adjective is derived from the noun.
Etymology from Wiktionary, CC BY-SA 3.0