Composition: A solution is a homogeneous mixture of two or more substances, while a compound is a pure substance with a definite chemical composition. This means that the composition of a solution can vary, while the composition of a compound is always the same.
Properties: The properties of a solution depend on the composition of the solution, while the properties of a compound do not depend on the composition of the compound. For example, the boiling point of a solution increases as the concentration of the solution increases, while the boiling point of a compound is always the same.
