The word laterites 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: 10
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (37 words)
aeriest, artiest, attires, elaters, iratest, iterate, latites, letters, litters, rattles, realest, realise, realist, relates, restate, retails, retaste, retiles, retilts, retitle, saltier, seriate, settler, slatier, slitter, starlet, starlit, startle, stealer, sterile, stilter, striate, tastier, tertial, testier, tilters, trestle