The word collateralize 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: 28
Highest Scoring Words With Friends™ Play In The Letters collateralize
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Seven Letter Word Alert: (33 words)
acerate, aircell, allelic, aloetic, areolae, article, calorie, coalier, coalite, coalize, coaltar, collate, collier, coterie, elector, erotica, erotize, etaerio, lacteal, lateral, literal, ocellar, realize, reallot, recital, tallier, treacle, zelator, zeolite, zoarial, zoecial, zorilla, zorille