The word acidulates 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: 16
Highest Scoring Words With Friends™ Play In The Letters acidulates
:
Seven Letter Word Alert: (30 words)
actuals, acuated, acuates, adulate, aliased, castile, castled, caudate, citadel, cladist, dacites, delicts, deltaic, details, dialect, dilates, dilutes, dualise, dualist, ductase, ductile, duelist, dulcets, elastic, laciest, lactase, lucites, saluted, sluiced, sulcate