The word peninsular 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: 17
Highest Scoring Words With Friends™ Play In The Letters peninsular
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Seven Letter Word Alert: (35 words)
alpines, ensnarl, insaner, insular, inulase, lineups, lupines, nailers, perusal, pinnule, plainer, planers, planner, praline, punners, punnier, purines, purlins, renails, replans, runnels, spaniel, spanner, spinner, spinule, sunnier, unlearn, unpairs, unparse, unrisen, unsnarl, upraise, uprisal, uprisen, urinals