The word forestries 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: 13
Highest Scoring Words With Friends™ Plays In The Letters forestries
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Seven Letter Word Alert: (32 words)
erotise, ferrets, ferries, ferrite, festers, foister, forests, forties, fosters, froster, refires, refrets, refries, resifts, resorts, resters, restirs, restore, retires, retries, rioters, roister, rosiest, rosters, sifters, softies, soirees, sorters, sorties, stereos, stories, strifes