The word conservator 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 conservator
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Seven Letter Word Alert: (66 words)
atoners, canoers, canters, cantors, carrots, carters, cartons, cartoon, carvers, carvone, caverns, cavorts, coarsen, coarser, coaster, consort, convert, corneas, corners, cornets, coronas, coroner, coronet, coverts, craters, cratons, cravers, creator, crooner, enactor, errants, nectars, octanes, octaves, orators, ornater, overact, overran, oversat, racoons, rancors, ranters, reactor, recants, recoats, rectors, reroast, reroots, roaster, rooster, rooters, savorer, scanter, scooter, scorner, senator, serovar, servant, snorter, starver, taverns, tracers, trances, treason, trocars, vectors