The word overcautious 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: 21
Highest Scoring Words With Friends™ Play In The Letters overcautious
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Seven Letter Word Alert: (53 words)
acerous, activer, actives, auteurs, carouse, cauters, cavorts, coaster, cooties, couture, coverts, cristae, cuatros, curates, curious, cursive, cutover, ecotour, erotica, erotics, evictor, octaves, outrace, outrave, outsoar, ovaries, overact, overcut, oversat, oversit, raciest, raucous, recoats, revuist, riotous, saucier, saviour, scooter, scoriae, scouter, sootier, stourie, uricase, urostea, vacuous, varices, various, vectors, veritas, victors, virtues, viscera, voicers