The word immunologist 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 immunologist
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Seven Letter Word Alert: (37 words)
gnomist, lionism, listing, logouts, looming, loosing, looting, lotions, lousing, lusting, minimus, misting, molting, mongols, moonlit, mooting, motions, moulins, mousing, oligist, ominous, ousting, outings, silting, sliming, smiling, smiting, soiling, soloing, sooting, stimuli, suiting, summing, tilings, timings, toiling, tooling