The word autoimmunities 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™ Plays In The Letters autoimmunities
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Seven Letter Word Alert: (54 words)
amentum, ammines, amounts, animism, animist, animose, atomise, atomism, attunes, aunties, autumns, imitate, inmates, inosite, instate, intuits, miniate, minimas, minimus, minuets, minutes, mismate, misname, mistime, mistune, mitiest, mittens, moisten, moments, mountie, munites, muonium, mutants, mutates, nutmeat, omentum, outmans, outmate, sinuate, situate, smitten, station, stomate, summate, tautens, tenuous, tetanus, teutons, timeout, tiniest, tsunami, tuition, unities, unmates