The word afforestation 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: 20
Highest Scoring Words With Friends™ Plays In The Letters afforestation
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Seven Letter Word Alert: (88 words)
affairs, affiant, affines, affront, antsier, artiest, artisan, atoners, atonias, atresia, attains, attires, efforts, erosion, fainter, fairest, fanfare, fattens, fattier, fatties, festoon, fireant, fitters, foister, footers, footsie, forfeit, forints, forties, insofar, instate, intorts, iratest, nastier, natters, nattier, nitrate, norites, notator, offsite, oneoffs, oration, orients, otarine, rations, rattons, rattoon, restaff, restain, retains, retinas, retints, retoast, risotto, rotates, saffron, satiate, senator, sniffer, snifter, snotter, sootier, staffer, stainer, station, stiffen, stiffer, stonier, straint, striate, taffeta, taffies, tariffs, tartans, tastier, tinters, toaster, toffier, toffies, toonies, tooters, tootsie, tornote, torsion, transit, treason, triones, tsarina