The word quinquefoliate is playable in Words With Friends™, but 1 blank substituting for the letter 'q' is 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: 29
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (21 words)
aliquot, antique, elation, elution, enolate, filiate, foliate, inflate, inquiet, lineate, outline, quieten, tailfin, tequila, tinfoil, toenail, toluene, tuneful, unequal, unquiet, unquote