The word rickettsial 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 rickettsial
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Seven Letter Word Alert: (91 words)
airiest, airlike, airsick, article, artiest, attires, cakiest, cartels, castile, catlike, cattier, ciliate, citrate, clarets, clatter, clitter, cristae, eclairs, elastic, elicits, elitist, iratest, irisate, italics, karites, karstic, kilters, kirtles, kitties, kittler, kittles, laciest, laicise, latites, lattice, lickers, litters, raciest, rackets, ratlike, rattles, realist, recital, restack, restick, retacks, retails, retilts, rickets, saclike, saltier, satiric, scalier, scarlet, scatter, silkier, siltier, skitter, skittle, slacker, slatier, slicker, slitter, stacker, stalker, starlet, starlit, startle, statice, sticker, stickle, stilter, striate, tackers, tackier, tackler, tackles, tactile, talkers, talkies, tastier, tertial, tickers, tickets, tickler, tickles, tilters, titlark, trickie, trickle, trisect