The word cotoneaster 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: 15
Highest Scoring Words With Friends™ Play In The Letters cotoneaster
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Seven Letter Word Alert: (71 words)
acerose, acetone, atoners, canoers, canters, cantors, careens, cartons, cartoon, cenotes, centers, centres, cerates, coarsen, coaster, consort, contest, contort, corneas, cornets, cornett, coronas, coronet, costate, cotters, cottons, cratons, creates, earnest, eastern, enactor, encores, entreat, estrone, natters, nearest, neatest, necrose, nectars, netters, notator, octanes, octants, octenes, racoons, rattons, rattoon, recanes, recants, recoats, reenact, restate, retaste, retoast, roseate, rosette, rotates, scanter, scatter, scenter, scooter, senator, snotter, sterane, tenters, ternate, toaster, tooters, tornote, trances, treason