The word promethiums 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: 23
Highest Scoring Words With Friends™ Play In The Letters promethiums
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Seven Letter Word Alert: (57 words)
hermits, heroism, hirsute, homiest, hotspur, humites, hummers, humpers, humpies, immures, impetus, imports, imposer, memoirs, moister, mopiest, mortise, mothers, mousier, mushier, mustier, optimum, outhire, permits, piteous, posture, pothers, pouters, poutier, premium, primost, promise, pushier, restump, ropiest, rosehip, rumshop, shimmer, shouter, smother, soupier, spouter, spumier, stepmom, stomper, stourie, strophe, stumper, thermos, thorium, thumper, toprims, tourism, triumph, troupes, umpires, uptimes