The word marlstones 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 marlstones
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Seven Letter Word Alert: (59 words)
almoner, anomers, antlers, armless, armlets, artless, artsmen, atoners, enamors, laments, lassoer, leantos, loaners, maestro, maltose, manless, mantels, mantles, martens, masters, matrons, mentors, meronts, moaners, molests, monster, morales, morsels, mortals, normals, oarless, oarsmen, orleans, ostlers, ransoms, reasons, reloans, rentals, reslant, salmons, saltern, seamost, senator, sermons, slaters, smarten, sortals, stamens, stanols, sternal, sterols, stoners, streams, stroams, stromal, tensors, tonearm, tramels, treason