The word fieldstone 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: 16
Highest Scoring Words With Friends™ Plays In The Letters fieldstone
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Seven Letter Word Alert: (31 words)
defiles, defines, delints, denoise, denotes, dentils, destine, eloined, enfolds, feedlot, felines, felsite, fileted, flensed, foisted, fondest, fondles, indoles, infolds, lefties, lenited, lenites, linseed, lionets, nestled, oilseed, olefins, oneself, stifled, tenfold, tensile