* By volume: Stars are *vastly* bigger than oceans. Even the smallest star is much larger than the entire Earth, which is much larger than any ocean.
* By mass: Stars are also much more massive than oceans. Even a small star contains more matter than all the water in all the Earth's oceans combined.
So, in terms of volume and mass, a star is much bigger than an ocean.
However, you could also think about it in other ways:
* By surface area: The surface area of an ocean is much larger than the surface area of a star. This is because stars are spherical, while oceans are spread out across the surface of a planet.
* By the number of things in them: You could argue that an ocean has more "things" in it (fish, plants, etc.) than a star, which is mostly just hot gas.
Ultimately, the answer to the question depends on how you define "bigger."
