The word collaterals 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 collaterals
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Seven Letter Word Alert: (36 words)
acaters, alecost, allstar, areolas, callers, callose, cartels, cellars, clarets, coalers, coaltar, coastal, coaster, collars, collate, colters, escolar, lactase, lacteal, lactose, lateral, locales, locates, ocellar, oracles, reallot, recalls, recoals, recoats, rosacea, scarlet, scleral, scrotal, solacer, stellar, tollers