The word thundercloud 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 thundercloud
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Seven Letter Word Alert: (53 words)
chortle, chunder, churned, clodder, clothed, cloture, clouded, clouted, coddler, coulter, counted, counter, courted, couture, crunode, cuddler, culture, curdled, douched, ductule, eductor, hounded, hundred, hurdled, hurtled, lunched, luncher, lurched, noduled, notched, notcher, outduel, recount, redound, retouch, rounded, roundel, thorned, throned, thunder, toddler, torched, touched, toucher, trodden, trounce, trundle, uncloud, uncoded, uncored, uncouth, uncured, unruled