The word polyphosphates 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: 26
Highest Scoring Words With Friends™ Plays In The Letters polyphosphates
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Seven Letter Word Alert: (40 words)
apostle, applets, apposes, hapless, hatless, hatshop, healths, healthy, hopples, hostels, laptops, loathes, loosest, lysates, oophyte, ooplast, opposes, papoose, pastels, phthaly, plashes, polyose, pothole, shapely, sheaths, soothes, soothly, sophtas, splashy, spyhole, staples, stylops, systole, taphole, teashop, topless, topples, toyless, toyshop, tyloses