The word betrothals 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: 16
Highest Scoring Words With Friends™ Play In The Letters betrothals
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Seven Letter Word Alert: (53 words)
abettor, bathers, batlets, batters, battler, battles, betroth, blaster, blather, bloater, blotter, boaster, boaters, bolster, bolters, borates, bothers, bottler, bottles, breaths, brothel, earshot, halters, harlots, hatters, herbals, holster, hostler, lathers, loather, loathes, lobster, rathole, rattles, rebaths, reblast, reboast, retoast, retotal, rotates, setbolt, shatter, slather, sorbate, stabler, starlet, startle, stealth, tablets, threats, throats, toaster, totable