The word amphibolites 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: 24
Highest Scoring Words With Friends™ Play In The Letters amphibolites
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Seven Letter Word Alert: (58 words)
abolish, albites, alibies, amplest, aplites, apostle, astilbe, atheism, atomise, baptise, baptism, betoils, bimetal, biolite, biolith, biphase, bipoles, bitmaps, blemish, elitism, halites, hamlets, haplite, holiest, homiest, hoplite, hostile, iambist, impales, impasto, implies, iolites, isolate, libates, limpest, limpets, lipomas, loathes, maltose, mobiles, mopiest, oiliest, opiates, optimal, palmist, pastime, phablet, phobias, pietism, pilates, potable, shamble, spambot, taphole, teashop, thimble, timbale, topsail