What relationship exists between an enzyme and a catalyst?

A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction. The fact that they aren't changed by participating in a reaction distinguishes catalysts from substrates, which are the reactants on which catalysts work. Enzymes catalyze biochemical reactions.

Relationship between the catalyst and enzyme:

Catalyst may be defined as the substance that can increase the rate of the chemical reaction. Catalyst do not change itself in the reaction. In the same way enzymes are bio catalyst that are used to increase the rate of the biochemical reaction.

The enzymes are generally made up of protein but it is not necessary that the catalyst is made of the protein. All enzymes can work acts as catalyst but all catalyst are not enzymes.