The word vibraphonists 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: 26
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (53 words)
abiosis, absinth, airship, arshins, aspirin, barhops, bastion, biotins, bishops, bistros, boarish, bonsais, hairpin, harpist, hatpins, inhabit, instars, invitro, isobars, isospin, ivorist, obtains, orphans, parsons, passion, pastors, patrons, phobias, pianist, piarist, pistons, prisons, raisins, rapists, raspish, rations, sabinos, saviors, siphons, sophtas, spirits, sprains, sprints, stonish, strains, tarnish, varnish, vibrant, vibrato, vibrios, virions, visions, visitor