The word immunocompetent is playable in Words With Friends™, but 1 blank substituting for the letter 'm' is 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™ Plays In The Letters immunocompetent
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Seven Letter Word Alert: (33 words)
comment, commune, commute, compete, compote, compute, connote, content, eminent, emotion, epitome, eupneic, memento, memetic, mention, miocene, mountie, nepotic, nominee, noncute, nonepic, nonmute, omentum, onetime, optimum, outcome, pimento, pinenut, pontine, poutine, timeout, umpteen, unction