The word colonisers 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: 15
Highest Scoring Words With Friends™ Play In The Letters colonisers
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Seven Letter Word Alert: (31 words)
censors, cession, cloners, closers, coiners, colossi, console, coolers, cosines, creosol, cresols, cronies, erosion, insoles, lesions, lioness, loonier, loonies, loosens, lossier, noosers, oleosin, oncosis, orioles, ossicle, recoils, recoins, resoils, seniors, slicers, sooners