Phoenix is about 96 times bigger than Cocos (Keeling) Islands.

Cocos (Keeling) Islands is approximately 14 sq km, while Phoenix is approximately 1,342 sq km, making Phoenix 9,488% larger than Cocos (Keeling) Islands.
Tip: This to-scale comparison of Cocos (Keeling) Islands vs. Phoenix uses the Mercator projection, which distorts the size of regions near the poles.