10 letters · 20 points in Scrabble
noun a person who joins with another in carrying out some plan (especially an unethical or illegal plan)
originFirst attested in 1550. From a complice, from Middle English complice, from Old French complice (“confederate”), from Latin complicāre (“fold together”). The article a became part of the word, through the influence of the word accomplish.
Etymology from Wiktionary, CC BY-SA 3.0