The word alphabetises 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: 21
Highest Scoring Words With Friends™ Play In The Letters alphabetises
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Seven Letter Word Alert: (50 words)
abashes, ablates, abseils, albites, aliases, aplites, ashiest, asphalt, astilbe, atheise, atlases, baptise, basalts, biathla, biphase, easiest, eatable, elapses, epistle, halites, hapless, haplite, hatless, heeltap, hessite, labiate, leashes, libates, lipases, palates, paleate, palsies, pastels, pasties, pelites, pestles, petless, phablet, pieless, pilates, pitless, plashes, pleases, spatial, stables, staples, tealess, teasels, tieless, tipless