The word decolonising 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 decolonising
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Seven Letter Word Alert: (61 words)
ceiling, cloning, closing, codings, codling, cognise, coiling, coining, cologne, condign, condole, condone, consign, console, cooling, deicing, dingies, doilies, eliding, elision, eloigns, endings, eosinic, goldens, goodies, idolise, incised, incline, indices, indigos, indoles, inlines, inosine, iodines, ionised, ionogen, ionones, legions, lending, lensing, lignins, lindens, lingoes, linings, lionise, loonies, loosing, nongods, nongold, noodles, noosing, oleosin, oncogen, sending, sidling, silicon, singled, slicing, sliding, soiling, soloing