The word cockatrices is playable in Words With Friends™, but 1 blank substituting for the letter 'c' is 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: 20
Highest Scoring Words With Friends™ Plays In The Letters cockatrices
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Seven Letter Word Alert: (38 words)
accites, arctics, arkosic, ascetic, cakiest, carsick, coakers, coarcts, coaster, cockets, cockier, cracket, cricket, cristae, erotica, erotics, karites, karstic, raciest, rackets, recoats, recocks, restack, restick, restock, retacks, rickets, rockets, scoriac, scoriae, seacock, stacker, sticker, stocker, tackers, tackier, tickers, troikas