The word trematodes 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: 14
Highest Scoring Words With Friends™ Play In The Letters trematodes
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Seven Letter Word Alert: (39 words)
dearest, demates, demotes, detorts, dotters, emoters, maestro, matters, meteors, radomes, readmes, reasted, redates, remated, remates, remotes, restate, retaste, reteams, retoast, roasted, roseate, rosette, rotated, rotates, sedater, smarted, smatter, smeared, stardom, started, steamed, steamer, stomate, stormed, tasered, toasted, toaster, treated