The word tinderboxes 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: 23
Highest Scoring Words With Friends™ Play In The Letters tinderboxes
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Seven Letter Word Alert: (77 words)
bedirts, bedotes, bedrest, bedsore, benders, bendier, bestrid, betides, binders, binodes, boneset, boniest, boreens, boxiest, boxtree, deboner, debones, debtors, deniers, denoise, denotes, deorbit, derbies, destine, detoxes, dextrin, diester, dieters, disrobe, ebonies, editors, endorse, enrobed, enrobes, entries, erotise, estrone, existed, extends, inboxes, inbreds, inbreed, indexer, indexes, indorse, norites, orbited, orients, oxbirds, oxbiter, rebinds, rebited, rebites, rebonds, reboxed, reboxes, reedits, reindex, rodents, roisted, rosined, seedbox, sixteen, snorted, sobered, sorbite, sortied, sterned, steroid, stonier, storied, strobed, tenders, tierods, tinders, trienes, triones