The word flabbergasts 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: 24
Highest Scoring Words With Friends™ Plays In The Letters flabbergasts
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Seven Letter Word Alert: (45 words)
abasers, abaters, ablates, abrases, abreast, algebra, arblast, artless, atlases, bagless, barbels, basalts, basters, belfast, blaster, braless, breasts, eartags, falsest, falters, fatberg, fleabag, gabbers, gabbler, gabbles, garbles, grabble, laagers, largess, largest, rabbets, reblast, reflags, seabags, searats, seastar, slaters, stabber, stabler, stables, stagers, stalags, tarsals, teabags, teargas