The word concretise 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 concretise
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Seven Letter Word Alert: (40 words)
cenotes, centers, centres, centric, cistern, citrons, coerces, coesite, coiners, conceit, concert, concise, cornets, cornice, coterie, cretins, cronies, eccrine, encores, enteric, enticer, entices, entries, erotics, erotise, estrone, necrose, norites, notices, octenes, orients, recites, recoins, scenter, science, section, sincere, stonier, trienes, triones