The word platyhelminth 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: 28
Highest Scoring Words With Friends™ Plays In The Letters platyhelminth
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Seven Letter Word Alert: (37 words)
ailment, aliment, alltime, amenity, anthill, anytime, aplenty, empathy, emptily, haplite, healthy, hyaline, hyalite, impanel, implant, ineptly, lamplit, laytime, lithely, meatily, naptime, nattily, netmail, nymphal, nymphet, patient, payment, penalty, pentail, pettily, phthaly, plainly, playlet, ptyalin, tenthly, thymine, tympani