The word showerheads 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: 19
Highest Scoring Words With Friends™ Play In The Letters showerheads
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Seven Letter Word Alert: (26 words)
adheres, ashweed, dashers, deashes, dowress, dowsers, drowses, headers, hearsed, hearses, heehaws, herdess, oarweed, resawed, reshoed, reshoes, reshows, resowed, shaders, shadows, sheared, showers, swashed, swasher, washers, whereas