The word sphalerite 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: 16
Highest Scoring Words With Friends™ Play In The Letters sphalerite
:
Seven Letter Word Alert: (78 words)
aeriest, aplites, atheise, elaters, epistle, halites, halters, haplite, hapters, harelip, harpies, harpist, hastier, healers, heapers, heaters, heeltap, helpers, lathers, leapers, leather, palters, parties, pastier, peatier, pelites, pelters, perlite, petrels, philter, philtra, philtre, pilates, pirates, plasher, plaster, platers, pleaser, preheat, prelate, presale, realest, realise, realist, reheaps, reheats, relapse, relates, repaste, repeals, repeats, repiles, replait, replate, repleat, replies, reptile, reshape, respelt, respite, resplit, retails, retapes, retiles, saltier, seriate, shalier, sharpie, shelter, slather, slatier, slither, stapler, stealer, sterile, tephras, traipse, triples