The word traineeship 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: 17
Highest Scoring Words With Friends™ Play In The Letters traineeship
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Seven Letter Word Alert: (91 words)
aeriest, airiest, airship, anthers, antsier, arenite, arsheen, arshine, aspirin, atheise, earnest, earthen, eastern, entraps, entries, ethanes, hairnet, hairpin, hapters, harpies, harpist, hastier, hatpins, heapers, hearten, heaters, heparin, heptane, hernias, inepter, inertia, inherit, inspire, irisate, nastier, nearest, neither, painter, panters, panther, panties, parents, parties, pastier, patines, peatier, pertain, phenate, pianist, piarist, pieties, pirates, pithier, pitiers, preheat, present, pretans, pterins, reheaps, reheats, repaint, repaste, repeats, repents, repines, reshape, reshine, respite, restain, retains, retapes, retinas, seriate, serpent, sharpen, sharpie, shinier, spinier, stainer, sterane, tarnish, tephras, terpine, therein, tiepins, tipsier, trainee, traipse, trepans, triaene, trienes