The word stainabilities 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: 19
Highest Scoring Words With Friends™ Play In The Letters stainabilities
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Seven Letter Word Alert: (50 words)
abettal, ablates, abseils, absents, abstain, albites, aliases, alibies, astilbe, atlases, attains, basalts, batlets, battens, battles, bitsets, blatant, elastin, elitist, enlists, entails, ileitis, initial, instate, labiate, latents, latites, lesbian, liaises, libates, listens, nabales, nailset, salient, salines, saltate, satiate, sealant, seitans, sestina, silanes, silents, stables, stalest, statins, tabinet, tablets, talents, tiniest, tinsels