Here are the oceans, sorted by area:

1. The Pacific Ocean: 161,760,000 km²
2. The Atlantic Ocean: Area: 85,133,000 km²
3. The Indian Ocean: Area: 70,560,000 km² 
4. Southern Ocean: Area: 21,960,000 km²
5. The Arctic Ocean: Area: 15,558,000 km²

The difference is that seas are smaller than oceans and are usually located where the land and ocean meet, and typically, seas are partially enclosed by land.
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