The word knickerbockers is playable in Words With Friends™, but due to the frequency of letters in the game of Words With Friends™, 2 blanks substituting for the letters k and k are required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 26
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (49 words)
beckons, berries, berserk, bickers, bonkers, boreens, brisken, brisker, brokers, cockier, coercer, coerces, coiners, concise, conkers, corkers, corners, cornice, cornier, cronies, crosier, ebonics, ebonies, eccrine, encores, enrober, enrobes, ironers, kickers, knicker, knocker, necrose, obscene, rebores, reckons, recocks, recoins, recorks, rerinse, rescore, rockers, rockier, science, scorner, scriber, sincere, skinker, snicker, soberer