9 letters · 16 points in Scrabble
noun a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below
verb cover with clapboards
originFrom Middle English clapholt, partial translation from Middle Low German klappholt or Middle Dutch klapholt (“barrel stave”), from klappen (“to crack”) + holt (“wood”). The part "holt" was later calqued to "board".
Etymology from Wiktionary, CC BY-SA 3.0