The word treacheries is playable in Words With Friends™, no blanks 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (75 words)
achiest, aeriest, aitches, archers, artsier, atheise, careers, carries, carters, cashier, caterer, cerates, charier, charter, chaster, cheater, cheerer, cithers, crasher, craters, creaser, creates, cristae, eeriest, erecter, erratic, etchers, etheric, hastier, hearers, heaters, hectare, heretic, raciest, reacher, reaches, rearise, rechart, recheat, reciter, recites, recrate, reerect, rehears, reheats, rehires, reshare, retches, reteach, retears, retiree, retires, retrace, retrees, retries, richest, scarier, secrete, seether, seriate, serrate, shearer, sheerer, sheeter, steerer, tarries, teacher, teaches, tearers, tearier, techies, terrace, tracers, trasher, triarch