The word limnologically 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: 29
Highest Scoring Words With Friends™ Play In The Letters limnologically
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Seven Letter Word Alert: (22 words)
acyloin, alginic, alimony, allonym, allying, calling, calming, cloying, coaling, coiling, cooling, illogic, locally, logical, looming, mailing, mangily, milling, million, monilia, myalgic, oomancy