The word combustibles 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: 26
Highest Scoring Words With Friends™ Plays In The Letters combustibles
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Seven Letter Word Alert: (62 words)
besmuts, betoils, bisects, blouses, boluses, bomblet, bumbles, busiest, bustles, celsius, cesiums, closest, closets, cobbles, cobless, combust, cosiest, costume, cubbies, cubisms, cubists, cubless, cultism, customs, embolic, embolus, emulsic, leucism, lobbies, locusts, lotuses, lucites, miscues, miscuts, mitoses, mobiles, molests, mueslis, muscles, oculist, oecists, ossicle, outlies, sitcoms, sluices, solutes, somites, stomies, stubble, stumble, subitem, sublets, sublime, sublist, submits, subsect, subsite, subslot, subsoil, tousles, tubless, tumbles