The word landholders 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (34 words)
adhorns, adorned, danders, dandler, dandles, dehorns, deodars, dollars, enlards, enrolls, hadrons, handers, handled, handler, handles, hardens, headons, heralds, hoarded, holders, hollers, ladders, landers, loaders, loaners, nodders, ordeals, orleans, reloads, reloans, saddler, shoaled, slander, snarled