The word synchroneity 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: 23
Highest Scoring Words With Friends™ Play In The Letters synchroneity
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Seven Letter Word Alert: (58 words)
chrysin, cistern, cithern, cithers, citrons, coheirs, coiners, consent, cornets, cretins, cronies, cystine, erotics, ethnics, heroics, heroins, histone, history, honesty, hornets, hosiery, inchers, inocyte, inshore, interns, intoner, intones, introns, isohyet, norites, notcher, notches, notices, octynes, orients, ostrich, recoins, rhotics, richest, scyther, section, shorten, snitchy, society, stenchy, stonier, synoecy, syntone, syntony, tension, thinner, thiones, thrones, tinhorn, tinners, torches, triones, triynes