The word henceforward 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: 25
Highest Scoring Words With Friends™ Play In The Letters henceforward
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Seven Letter Word Alert: (46 words)
adherer, adorner, archfoe, arrowed, charred, chowder, cohered, coherer, cowered, cowhand, cowherd, crowned, decrown, defacer, deforce, dwarfer, encoder, encored, enforce, forward, forwarn, froward, frowned, frowner, hoarder, nowhere, oarweed, orchard, ranched, rancher, reached, reacher, readorn, recaned, recower, recrown, redrawn, reendow, refaced, reheard, rehoned, roached, wafered, waferer, whereof, whereon