The word antiparticle 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: 20
Highest Scoring Words With Friends™ Play In The Letters antiparticle
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Seven Letter Word Alert: (88 words)
airline, alicant, anaptic, apatite, aplitic, apteria, article, caliper, caltrap, cantrap, cantrip, capital, captain, carinae, carinal, cattail, cattier, central, certain, ciliate, citrate, citrine, cittern, clatter, clipart, clitter, cranial, icepail, inciter, inertia, inplace, lacinia, lactate, latrine, lattice, lintier, nattier, nictate, nitrate, nitrite, nittier, painter, panicle, partial, patient, patinae, patrial, pattern, pelican, pelitic, pentail, pertain, picante, picrate, picrite, pintail, placate, plainer, planeta, plantar, planter, platter, plicate, praline, prattle, ratline, rattail, recital, reliant, repaint, replait, replant, replica, retinal, tactile, tailpin, tantric, tartpan, teacart, tertial, tetanic, tilapia, tintier, tipcart, titanic, trenail, triplet, triptan