The word spearmint 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
Seven Letter Word Alert: (45 words)
antsier, armpits, artsmen, entraps, imparts, inmates, marines, martens, martins, minaret, minters, naptime, nastier, painter, panters, panties, parents, parties, pastier, pastime, patines, permits, pertain, pirates, pretans, primase, primate, pterins, raiment, remains, remints, repaint, restain, restamp, retains, retinas, seminar, sirname, smarten, smartie, stainer, stamper, tampers, traipse, trepans