The word carboxylates 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
Seven Letter Word Alert: (79 words)
abaters, abators, ablates, ablator, abreact, abreast, acaters, acatery, acetyls, acolyte, acrobat, actable, acylase, acylate, alecost, arblast, areolas, arylate, astylar, barleys, beastly, betrays, blaster, bloater, boaster, boaters, bolster, bolters, borates, boxcars, cabaret, cablers, calyxes, carboxy, carboys, cartels, clarets, cloyers, coalers, coaltar, coastal, coaster, coaxers, cobalts, colters, cotylae, cotylar, cotyles, crayola, crystal, escolar, exactly, exactor, lactase, lactose, laxator, lobster, locates, oracles, oxalate, oxcarts, oxysalt, reblast, reboast, recoals, recoats, rosacea, saltbox, sayable, scarlet, scrotal, soberly, solacer, sorbate, stabler, tabasco, taxable, taxably, treacly