The word archipelago 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: 22
Highest Scoring Words With Friends™ Play In The Letters archipelago
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Seven Letter Word Alert: (27 words)
achiral, acholia, airhole, apogaic, apogeal, apogeic, archeal, caliper, calorie, cholera, choragi, chorale, choregi, coalier, epochal, glacier, gracile, graphic, haircap, harelip, paralog, pelagic, pergola, poacher, polaric, regalia, replica