The word workmanships 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: 28
Highest Scoring Words With Friends™ Plays In The Letters workmanships
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Seven Letter Word Alert: (27 words)
airshow, amorphs, arshins, mawkish, mishaps, mohawks, monkish, orphans, parsons, passion, pinworm, prisons, ransoms, raspish, shipman, shopman, showman, shrimps, shrinks, siphons, snakish, sprains, warmish, warship, waspish, workman, worship