Coenzymes are unique organic molecules that catalyze enzymatic reactions in living organisms. These essential molecules can be categorized into several types, including antioxidants, co-factors, and co-substrates. Synonyms for coenzymes include activators, cofactors, prosthetic groups, and metabolites. Activators refer to the molecules that bind to enzymes, promoting the efficiency of enzymatic activity. Cofactors are organic or inorganic molecules that bind to enzymes, promoting their activity. Prosthetic groups are tightly bound coenzymes which are incorporated into the enzyme structure, while metabolites are small molecules that participate in enzymatic reactions, are transformed, and then become products. By using these various synonyms, scientists can describe the vital role that coenzymes play in metabolic reactions.