The word groundspeed 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (57 words)
dengues, denuder, denudes, depends, deponed, depones, deposed, deposer, despond, dodgers, dredges, dresden, drudges, endorse, endured, endures, ensured, genders, godsend, gourdes, grounds, grouped, groused, guerdon, negroes, nodders, openers, perused, ponders, pounded, pounder, pronged, reddens, redound, reopens, reposed, resound, respond, rounded, seedpod, snudged, sounded, sounder, spender, spondee, sponged, sponger, spurned, supered, surgeon, undergo, undoers, undoped, undosed, unedged, unposed, upended