The word vibraphonist 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™ Plays In The Letters
Seven Letter Word Alert: (27 words)
absinth, airship, aspirin, barhops, bastion, biotins, boarish, hairpin, harpist, hatpins, inhabit, invitro, ivorist, obtains, orphans, patrons, phobias, pianist, piarist, rations, tarnish, varnish, vibrant, vibrato, vibrios, virions, visitor