The word refractories 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™ Plays In The Letters
Seven Letter Word Alert: (89 words)
acerose, aeriest, artsier, careers, carrier, carries, carrots, carters, caterer, cerates, coarser, coaster, coesite, corsair, coterie, crafter, craters, creaser, creates, creator, cristae, crofter, crosier, erector, erotica, erotics, erotise, erratic, etaerio, factors, faeries, fairest, ferrari, ferrets, ferries, ferrite, fiercer, foister, forcers, forties, fraters, freesia, froster, raciest, rafters, reactor, rearise, rearose, reciter, recites, recoats, recraft, recrate, rectors, refaces, refects, refires, refract, refrets, refries, reroast, rescore, restore, retears, retirer, retires, retrace, retries, rioters, roarers, roaster, roister, roseate, scarier, scoriae, seriate, serrate, sorrier, stirrer, tarrier, tarries, tearers, tearier, terrace, terrier, terroir, terrors, tracers, trocars