The word vinblastines 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: 22
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (38 words)
abseils, absents, albites, alibies, aniline, asinine, astilbe, biennia, elastin, enlists, entails, estival, ilvaite, inlines, invents, invests, invites, lesbian, liaises, libates, linnets, listens, nailset, naivest, natives, salient, salines, seitans, sestina, siennas, silanes, silents, silvans, snivels, stables, tinsels, vainest, visible