The word vulcaniser 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: (36 words)
arcsine, arsenic, auricle, carnies, cauline, caverns, caviler, clavier, curials, cursive, eclairs, incurve, insular, inulase, lancers, nailers, nuclear, ravines, recusal, renails, saucier, scalier, secular, sluicer, surveil, unclear, unlaces, unravel, unveils, uricase, urinals, valuers, varices, velaric, vesical, viscera