The word proficiently 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: 25
Highest Scoring Words With Friends™ Play In The Letters proficiently
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Seven Letter Word Alert: (56 words)
certify, citrine, conifer, cornfly, cornily, cretify, encrypt, entropy, fiction, fierily, fintype, firelit, firepit, firepot, iconify, inciter, ineptly, inertly, inflect, inflict, inocyte, lection, lintier, liriope, loftier, nepotic, niftier, niftily, nitrify, oilfire, pelitic, petrify, picrite, pinfire, pinitol, pointer, politer, politic, porcine, potency, profile, proline, pronely, protein, pyloric, pyritic, rectify, repilot, repoint, retinol, tinfoil, topline, torpefy, torpify, trefoil, tripole