A solution has two components: solute which is the minor component and a solvent which is the major component in which a solute is dissolved.
For example: a salt solution is essentially sodium chloride (NaCl) dissolved in water. Here: NaCl is the solute and water is the solvent
Reactant and product are terms used in the context of chemical reactions, Reactant is an element or a compound that combines with another compound to form one or more products.
In the given example: a swimming pool has two components: chloride solute (disinfectant) dissolved in a water solvent. Hence it is a solution.
