The word supernatural 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 supernatural
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Seven Letter Word Alert: (86 words)
anapest, antlers, arsenal, aurates, austral, auteurs, eluants, entraps, errants, estrual, lunates, narrate, natural, natures, neurula, neutral, nurture, paenula, palates, palters, panters, parents, partner, pasture, peanuts, peasant, penults, perusal, planers, planeta, planets, plantar, planter, plaster, plateau, platers, praters, pretans, pruners, pulsate, punster, punters, pursuer, pustule, ranters, rapture, rentals, replans, replant, reslant, restrap, retraps, returns, rupture, rustler, saltern, saltpan, saluter, saunter, sealant, snarler, spartan, spatula, spurner, spurter, stapler, sternal, sultana, suntrap, surreal, sutural, tarpans, trepans, tuneups, turners, unalert, unalter, unparse, unstrap, untraps, untruer, uprates, uprears, upslant, upturns, usurper