The word trephination 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: 19
Highest Scoring Words With Friends™ Plays In The Letters trephination
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Seven Letter Word Alert: (40 words)
another, entrain, entrant, hairnet, hairpin, heparin, inertia, inherit, intoner, nattier, nephron, nitrate, nitrite, nittier, operant, otarine, painter, panther, patient, patriot, pattern, pertain, phonier, pinnate, pithier, pointer, pontine, portent, pronate, protean, protein, repaint, repoint, thinner, thorite, tinhorn, tinnier, tintier, tiptoer, triptan