The word ethnocentric 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: 22
Highest Scoring Words With Friends™ Plays In The Letters ethnocentric
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Seven Letter Word Alert: (33 words)
centric, cheerio, choicer, chronic, cithern, cittern, conceit, concern, concert, connect, content, cornett, cornice, coterie, crochet, eccrine, enteric, enticer, etheric, heretic, heroine, intoner, neither, nitrene, notcher, tentier, therein, thereon, thereto, thinner, thorite, tinhorn, trochee