Here's a breakdown:

* Proteases: This is the more general term for enzymes that break down proteins. They are often classified based on their mechanism of action, such as serine proteases, cysteine proteases, etc.

* Peptidases: This term specifically refers to enzymes that break down peptide bonds, which are the bonds that link amino acids together to form proteins.

So, while both terms are used to describe enzymes that break down proteins, "proteases" is a broader term, while "peptidases" is more specific to the type of chemical bond they break.