The word machicolate 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: 23
Highest Scoring Words With Friends™ Play In The Letters machicolate
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Seven Letter Word Alert: (24 words)
acclaim, acholia, alethic, aloetic, cacemia, cacolet, calcite, caliche, caltech, chalice, chaotic, cholate, choleic, climate, cloacae, coalite, cochlea, coeliac, cometic, comical, ethical, metical, oatmeal, thalami