The word demisemiquaver 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: 35
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (58 words)
admires, adverse, advisee, adviser, airside, dairies, dearies, derives, deserve, devisee, deviser, diaries, dimmers, diverse, dummies, emersed, esquire, evaders, immerse, immured, immures, maimers, marquee, marques, marquis, measure, mediums, medusae, mermaid, midairs, misaver, misdeem, mismade, misread, quavers, queered, queried, queries, quivers, radiums, readies, readmes, redeems, requiem, resaved, residue, resumed, revised, seamier, seedier, seriema, severed, sidearm, siriema, smarmed, smeared, squared, squired