The word simultaneity 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: 20
Highest Scoring Words With Friends™ Plays In The Letters simultaneity
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Seven Letter Word Alert: (77 words)
ailment, aliment, amenity, amnesty, amulets, animist, anytime, attunes, aunties, elastin, elitism, elitist, eluants, emulant, emulsin, entails, imitate, inmates, instate, instyle, intuits, inulase, laments, latents, latites, laytime, lunates, luniest, lutites, mantels, mantles, meatily, mensual, miniate, minuets, minutes, mistily, mistune, mitiest, mittens, munites, mustily, mutants, mutates, myelins, nailset, nastily, nattily, netmail, nutlets, nutmeal, nutmeat, saintly, salient, satiety, seminal, sinuate, situate, smitten, stately, stimuli, stylate, talents, tastily, tautens, testily, tetanus, tiniest, tsunami, unities, unmates, unsilty, unsmelt, untasty, utensil, utilise, utility