Proteinases are enzymes that hydrolyze peptide bonds in proteins, producing smaller peptides and amino acids. These enzymes are crucial for many biological processes, including digestion, blood clotting, and tissue remodeling. There are several synonyms for proteinases, which are often used interchangeably. Some commonly used synonyms for proteinases include proteases, peptidases, and proteolytic enzymes. Other synonyms include protein-digesting enzymes, protein-splitting enzymes, and proteolytic cleavage enzymes. Regardless of the synonym used, proteinases play a vital role in many biological processes, making them an essential focus of research in both academic and industrial settings.