The word precancerous 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: 23
Highest Scoring Words With Friends™ Play In The Letters precancerous
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Seven Letter Word Alert: (75 words)
accruer, accrues, accurse, accuser, acerose, acerous, arouser, cancers, canoers, careens, careers, carouse, carpers, censure, coarsen, coarser, coercer, coerces, concurs, corneas, corners, courser, creaser, cuprene, earners, encores, ensurer, erasure, escaper, eupneas, eupnoea, necrose, openers, pencase, persona, pouncer, pounces, pourers, prancer, prances, prerace, procure, pruners, rancors, rancour, reapers, rearose, recanes, recoups, recures, recurse, reoccur, reopens, repaces, reparse, reposer, repours, reprune, rerapes, rescope, rescore, rescuer, respace, scarcer, scorner, scourer, scraper, securer, spearer, sprucer, spurner, uncapes, unparse, uprears, uproars