The word dasymeters 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™ Play In The Letters dasymeters
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Seven Letter Word Alert: (34 words)
dearest, demasts, demates, deserts, dessert, essayed, essayer, masters, mastery, meadery, readmes, reasted, redates, remated, remates, reseats, restems, reteams, seamers, seaters, sedater, sedates, smarted, smeared, stayers, steamed, steamer, strayed, streams, streamy, tasered, teasers, tressed, yeasted