The word christianising 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: 23
Highest Scoring Words With Friends™ Play In The Letters christianising
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Seven Letter Word Alert: (47 words)
airings, arching, arising, arshins, canting, carting, cashing, casings, casting, chagrin, chasing, craning, crating, garnish, gastric, gastrin, hinting, hissing, incants, inching, ingrain, insight, instars, itching, niacins, racists, raining, raising, raisins, ranting, ratings, rinsing, risings, sashing, satiric, scaring, sharing, shining, snaring, sringas, stannic, staring, strains, strings, tarnish, tigrish, tracing