The word overgarment 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: 21
Highest Scoring Words With Friends™ Play In The Letters overgarment
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Seven Letter Word Alert: (31 words)
avenger, averter, engrave, garment, gatemen, germane, grantee, granter, greaten, greater, groaner, magneto, meagrer, megaton, montage, oranger, ornater, overage, overarm, overate, overeat, overman, overran, reagent, regrant, regrate, remoter, remover, terrane, tonearm, veteran