The word aestivating 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: 18
Highest Scoring Words With Friends™ Plays In The Letters aestivating
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Seven Letter Word Alert: (34 words)
against, agatine, agatise, agitate, attains, aviates, avigate, eviting, ignites, instate, invites, naivest, natives, satiate, seating, setting, sieving, sitting, stating, stative, staving, stiving, tasting, teasing, testing, tiniest, vaginas, vainest, vantage, vatting, vesting, vetting, vintage, vitiate