The word periodically 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: 23
Highest Scoring Words With Friends™ Play In The Letters periodically
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Seven Letter Word Alert: (54 words)
acridly, aedilic, aircell, alloyed, caliper, calorie, caroled, cedilla, ciliary, clayier, clearly, coalier, codilla, codille, collard, collide, collier, cordial, decrial, deliria, dialler, dipolar, icepail, ideally, idyllic, leopard, lipread, liriope, loyaler, lyrical, ocellar, oldlace, oracled, paroled, payroll, pillory, placode, ploidal, ploidic, polaric, polarly, policed, pollard, predial, prelacy, preload, pyloric, radicel, radicle, rallied, rapidly, readily, redpoll, replica