The word carburetors 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (49 words)
aborter, abortus, acerous, arbours, arouser, barters, becrust, bescour, boaster, boaters, borates, bracers, bursate, carouse, carrots, carters, cauters, coarser, coaster, courser, craters, creator, cuatros, curates, curator, obscure, obtuser, outrace, reactor, reboast, reburst, recoats, rectors, reroast, rescrub, retours, roarers, roaster, routers, scourer, scouter, sorbate, subrace, terrors, tourers, tracers, trocars, trouser, urostea