The word semiprecious 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: 22
Highest Scoring Words With Friends™ Plays In The Letters semiprecious
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Seven Letter Word Alert: (76 words)
cerises, ceriums, cesiums, compere, copiers, corpses, courses, cruises, empires, empiric, empress, epicure, epimers, episome, espouse, impious, imposer, imposes, impress, isomere, isomers, meioses, meiosis, mercies, messier, miscues, misuser, mossier, mousers, mousier, percuss, peruses, pierces, pissier, poesies, poseurs, precise, premise, premiss, presume, process, promise, prussic, pumicer, pumices, pussier, recipes, recoups, recuses, reissue, reposes, rescope, rescues, respice, resumes, ruesome, scrimps, secures, seismic, serious, simpers, soirees, soupier, sources, species, spermic, spicers, spicier, spruces, spumier, sucrose, supreme, surmise, suspire, umpires, uprises