The word decolonises 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: 17
Highest Scoring Words With Friends™ Play In The Letters decolonises
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Seven Letter Word Alert: (33 words)
cession, codeine, colossi, condole, console, cosines, deciles, decline, denoise, diesels, diocese, eloined, enclose, encodes, endless, iceless, indoles, insoles, lesions, license, linseed, lioness, loonies, loosens, noodles, nosodes, oilseed, oldness, oleosin, oncosis, ossicle, seconds, silence