The word superseding 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: 19
Highest Scoring Words With Friends™ Play In The Letters superseding
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Seven Letter Word Alert: (70 words)
dengues, deniers, depress, designs, desires, despise, digress, dressup, endures, ensured, ensures, genders, genesis, genuses, greisen, guessed, guesser, gussied, ingress, insured, insures, peering, penises, perused, peruses, pingers, preside, pressed, pudgier, purines, pursing, pussier, redness, reguide, reigned, reissue, repined, repines, resends, resides, residue, resigns, respins, reusing, ripened, sedgier, seeding, seeping, senders, signees, signers, singers, snipers, snudges, spender, spiders, springs, spurges, spurned, sudsier, sudsing, sunrise, supered, suspend, suspire, undress, unipeds, uprisen, uprises, upsides