* Solvent: A solvent is a substance that dissolves another substance (the solute) to form a solution. Think of water dissolving sugar.

* Solution: A solution is a homogeneous mixture of two or more substances.

Oxygen is a gas and is typically found as a component of air. In air, oxygen is the solute, dissolved within the solvent which is primarily nitrogen.

To summarize:

* Oxygen can be a solute when dissolved in other substances (like nitrogen in air).

* Oxygen itself is not a solvent or a solution.