The word groundbreaker 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: 25
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (60 words)
adorner, aground, angered, arbored, barreed, boarder, bondage, bounder, brander, branked, breaker, broaden, broader, burgeon, deboner, derange, drunker, enraged, enrobed, enrober, gerbera, gnarred, goburra, grander, grenade, groaned, groaner, guarder, guerdon, gurnard, kerogen, knarred, kneader, knurred, oranger, orderer, readorn, reargue, rebadge, rebaked, rebegan, rebegun, reboard, rebored, rebound, rebrand, rebuked, rebuker, regrade, reorder, reurged, rongeur, rounder, unbaked, unboard, unbrake, unbroke, undergo, uneager, unrobed