The word anthracites 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: 17
Highest Scoring Words With Friends™ Play In The Letters anthracites
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Seven Letter Word Alert: (93 words)
acaters, achiest, actants, aitches, anarchs, anthers, antsier, archean, arcsine, arctans, arsenic, arshine, artiest, artisan, atheist, atresia, attache, attains, attires, canters, carinae, carnies, cashier, cattier, certain, chainer, chanter, chasten, chaster, chatter, cistern, cithern, cithers, citrate, cittern, cretins, cristae, etchant, ethnics, hairnet, hastate, hastier, hatters, hernias, hitters, inchers, inreach, instate, iratest, nastier, natters, nattier, nectars, nictate, nitrate, raciest, rainhat, ranches, ratchet, rattish, recants, rechain, restain, retains, retinas, retints, richest, satanic, satiate, scanter, scatter, shatter, stainer, statice, straint, stretch, striate, tantric, tarnish, tartans, tartish, tastier, teacart, tetanic, threats, tinters, tithers, trachea, trances, tranche, transit, trisect, tsarina