The word weathervanes 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: 22
Highest Scoring Words With Friends™ Play In The Letters weathervanes
:
Seven Letter Word Alert: (43 words)
aerates, anthers, arsheen, earnest, earthen, eastern, entrees, ethanes, ethenes, evenest, harvest, hearten, heaters, heavens, heavers, hetaera, nearest, reheats, reshave, rethaws, reweave, seether, servant, seventh, sheeter, sterane, sweater, sweeten, sweeter, taverns, teaware, veneers, veteran, wanters, weather, weavers, western, wharves, wheaten, whereas, whereat, wreathe, wreaths