The word concreteness 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: 20
Highest Scoring Words With Friends™ Play In The Letters concreteness
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Seven Letter Word Alert: (40 words)
cenotes, censers, censors, centers, centres, coerces, concern, concert, connect, consent, cornets, corsets, cresset, encores, entrees, escorts, essence, estrone, necrose, nesters, octenes, oneness, renests, rennets, resects, resents, scenter, sconces, screens, secerns, secrete, secrets, sectors, soccers, sonnets, stenose, stereos, stoners, tenners, tensors