The word equestrians 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 equestrians
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Seven Letter Word Alert: (83 words)
aeriest, antique, antsier, arenite, aunties, austere, earnest, easiest, eastern, enquire, ensears, ensuite, ensures, entries, equates, equines, esquire, euaster, inquest, inserts, instars, insures, nastier, natures, nearest, nesters, neuters, nutsier, qintars, querent, queries, querist, quieten, quieter, reissue, renests, request, requite, reseats, resents, restain, retains, retinas, retunes, reunite, sateens, satires, saunter, seaters, seitans, seitens, senates, sensate, sequent, sequins, seriate, sestina, sestine, sinters, sinuate, squares, squints, squires, squirts, stainer, sterane, strains, suiters, sunrise, sunstar, sustain, teasers, tenures, trainee, triaene, trienes, uniters, unreset, unrests, unseats, ureases, urinate, uterine