The word tachistoscope 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: 24
Highest Scoring Words With Friends™ Plays In The Letters tachistoscope
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Seven Letter Word Alert: (76 words)
accepts, accites, accosts, achiest, aitches, ascetic, ascites, aseptic, ashiest, aspects, atheist, cachets, cahoots, catches, cesspit, chaises, chaoses, chaotic, cheapos, chipset, choices, chooses, ciscoes, coaches, cooties, cosiest, costate, ectopia, ectopic, haptics, hepatic, hospice, hotpots, hotspot, icecaps, isopach, isotope, oecists, ootheca, opiates, pasties, patches, patties, pettish, pitches, poaches, poetics, pooches, potiche, potshot, potties, sachets, scapose, scathes, sceptic, septics, shitpot, soothes, sophtas, spastic, spicate, statice, statics, tactics, taoists, teapots, teashop, theists, tictacs, tictocs, tipcats, tiptoes, toecaps, tootsie, topcoat, tosspot