The word roentgenium 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: 19
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (36 words)
eminent, emoting, genuine, gourmet, goutier, gumtree, integer, intoner, meeting, mention, minuter, mitogen, morning, mounter, mountie, neutron, nitrene, nominee, nonmute, onetime, outgrin, regimen, remount, renting, reunion, reunite, ringmen, routine, routing, runtime, teeming, touring, treeing, turning, unmerge, uterine