The word plenteously 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: 20
Highest Scoring Words With Friends™ Plays In The Letters plenteously
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Seven Letter Word Alert: (29 words)
eluents, enstyle, eustely, eustyle, eyespot, leptons, neotype, onestep, openest, opulent, outsell, outyell, outyelp, pellets, pentose, penults, plutons, pollens, pollute, poteens, pullets, pulleys, sellout, steeply, stollen, tensely, toluene, toupees, unspell