The word carburettors 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: 19
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (82 words)
abettor, aborter, abortus, abutter, acerous, acutest, arbours, arouser, astuter, barters, batters, becrust, bescour, boaster, boaters, borates, bracers, bursate, butters, carouse, carrots, carters, cauters, coarser, coaster, costate, cotters, courser, craters, creator, cuatros, curates, curator, cutrate, cutters, obscure, obtuser, outbats, outbets, outcast, outrace, outrate, ratters, reactor, reboast, reburst, recoats, rectors, reroast, rescrub, restart, retoast, retorts, retours, retract, roarers, roaster, rotates, rotters, routers, scatter, scourer, scouter, sorbate, starter, stature, stouter, subrace, terrors, toaster, torture, tourers, touters, tracers, tractor, trocars, trouser, truster, turbots, turrets, tutorer, urostea