The word spontaneously 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: 22
Highest Scoring Words With Friends™ Plays In The Letters spontaneously
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Seven Letter Word Alert: (82 words)
annulet, aplenty, apostle, aptness, autopsy, eluants, ensouls, eustasy, layouts, leantos, leptons, loosens, loosest, lotuses, lunates, lysates, napless, nepotal, nonlate, nonleap, nonplay, nonplus, nonsale, nonstop, noseans, ooplast, opulent, osteons, outlays, outleap, outplan, outplay, outsole, outspan, outyelp, passout, pastels, payouts, peanuts, penalty, penults, planets, platoon, plutons, polyose, pulsate, punless, saloons, salutes, sensual, solutes, sonnets, soonest, spousal, stanols, staples, stepson, stylops, sultans, sunspot, suntans, synapse, syntans, syntone, systole, taluses, topless, tousles, toyless, tunnels, tyloses, unloose, unplays, unseals, unseats, unsnaps, unsoapy, unspent, unstops, upslant, yaupons, youpons