The word substitutabilities cannot be made in Words With Friends™. It is 18 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Play In The Letters substitutabilities
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Seven Letter Word Alert: (57 words)
ablutes, abseils, albites, alibies, astilbe, attests, aulists, autists, babiest, bassets, bassist, batlets, battles, baubles, biasses, bitsets, blisses, busiest, bustles, butties, elitist, ileitis, lassies, latites, liaises, libates, lutists, lutites, salutes, siestas, situate, stables, stalest, statist, statues, statute, stubble, sublets, sublist, subsets, subsist, subsite, subtest, tabbies, tablets, taluses, tassels, tattles, tautest, tebibit, tissues, titbits, titlist, tubless, tubules, tussles, utilise