The word pericardiums 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 pericardiums
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Seven Letter Word Alert: (93 words)
admirer, admires, airside, aspired, aspirer, auspice, caesium, campers, campier, carders, carpers, carried, carries, ceriums, cramped, crimped, crimper, crisped, crisper, cruised, cruiser, crusade, curried, curries, dairies, dampers, decamps, despair, diapers, diaries, dimeric, diprism, drapers, dumpers, dumpier, eardrum, empiric, icedams, icespar, impairs, impurer, married, marries, midairs, miscued, mispaid, misread, mudcaps, murders, prairie, praised, praiser, prearms, pricers, pricier, primase, primers, pumiced, pumicer, pumices, radices, radiums, raiders, rapider, raspier, repairs, saucier, scamped, scamper, scarier, scarped, scarred, scraped, scraper, sidearm, sidecar, siriema, spacier, sparred, spermic, spicier, spruced, sprucer, spumier, spurred, suicide, umpired, umpires, upraise, uprears, upriser, uraemic, uricase