The word pyrophosphates is playable in Words With Friends™, but 1 blank substituting for the letter 'p' 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: 25
Highest Scoring Words With Friends™ Plays In The Letters pyrophosphates
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Seven Letter Word Alert: (68 words)
apposer, apposes, atrophy, earshot, hapters, hatshop, hearths, hoorays, hoppers, oophyte, opposer, opposes, oppress, ospreys, oysters, papoose, pasters, pastors, perhaps, pessary, phrases, poopers, poorest, poppers, poroses, posters, pothers, prepays, prophet, propose, pyropes, rashest, repasts, reposts, reshoot, respots, sappers, seaport, seraphs, shapers, sheaths, sherpas, shooter, shopper, shyster, soapers, soother, soothes, sophtas, soppers, sparest, spryest, stayers, stooper, stopper, storeys, strappy, strophe, stroppy, tappers, teashop, tephras, therapy, toppers, toprope, toyshop, trashes, yappers