The word immutabilities 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: 25
Highest Scoring Words With Friends™ Play In The Letters immutabilities
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Seven Letter Word Alert: (38 words)
ablutes, albites, alibies, amulets, astilbe, batlets, battles, bemauls, bimetal, bulimia, bummest, butties, elitism, elitist, embalms, iambist, ileitis, imitate, latites, libates, lutites, militia, mismate, mistime, mitiest, mumbles, mutable, mutates, situate, stimuli, stumble, subitem, sublime, summate, tablets, timbale, tumbles, utilise