The word watermelons 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 watermelons
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Seven Letter Word Alert: (85 words)
almoner, anomers, antlers, areoles, armlets, artsmen, atoners, awesome, earnest, eastern, elaters, emoters, enamels, enamors, enolase, enolate, enteral, estrone, eternal, laments, lateens, leaners, leanest, leantos, loaners, maestro, maltose, mantels, mantles, martens, matrons, meanest, melters, mentors, meowers, meronts, meteors, moaners, monster, morales, mortals, nearest, normals, oarsmen, oleates, omelets, orleans, realest, relates, relents, reloans, remates, remelts, remotes, renames, renewal, rentals, reslant, resmelt, reteams, roseate, roselet, saltern, seaworm, seaworn, senator, smarten, smelter, stealer, steamer, sterane, sternal, stromal, sweater, swelter, telomer, tonearm, tramels, treason, trowels, wanters, warmest, western, wrenlet, wrestle