The word vulcanites 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: 20
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (34 words)
actives, aunties, cantles, castile, cauline, clients, cutline, elastic, elastin, eluants, entails, estival, inulase, invects, laciest, lancets, lucites, lunates, lunatic, luniest, nailset, naivest, natives, nutcase, salient, sinuate, stencil, sulcate, unlaces, unveils, utensil, vainest, vesical, victual