The word pyrophosphate 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: 24
Highest Scoring Words With Friends™ Plays In The Letters pyrophosphate
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Seven Letter Word Alert: (38 words)
apposer, atrophy, earshot, hapters, hatshop, hearths, hoorays, hoppers, oophyte, opposer, papoose, perhaps, poopers, poorest, poppers, pothers, prepays, prophet, propose, pyropes, reshoot, seaport, shooter, shopper, soother, stooper, stopper, strappy, strophe, stroppy, tappers, teashop, tephras, therapy, toppers, toprope, toyshop, yappers