The word limnologist 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 limnologist
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Seven Letter Word Alert: (31 words)
gnomist, instill, lilting, lionism, listing, looming, loosing, looting, lotions, milling, million, misting, molting, mongols, moonlit, mooting, motions, oligist, silting, sliming, smiling, smiting, soiling, soloing, sooting, tilings, tilling, timings, toiling, tolling, tooling