The word keratoconus 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (79 words)
acerous, atoners, cankers, canoers, canters, cantors, carouse, cartons, cartoon, cauters, centaur, coakers, coarsen, coaster, conkers, consort, contour, cookers, corneas, cornets, coronas, coronet, counter, cratons, crouton, cuatros, curates, ecotour, enactor, encrust, korunas, natures, nectars, nutcake, nutcase, octanes, onerous, outearn, outrace, outrank, outrock, outsoar, rackets, racoons, rankest, recants, reckons, recoats, recooks, recount, reknots, restack, restock, restuck, retacks, rockets, saunter, scanter, scooter, scouter, senator, snooker, stacker, stocker, tackers, tankers, tonsure, toucans, trances, treason, trounce, tuckers, uncarts, uncorks, uncrate, unstack, unstock, untrack, urostea