Read the name firstMost digestive enzymes are named for what they cut, with -ase tacked on the end: amylase splits starch (amylum), lipase splits lipid, lactase splits lactose, peptidases split peptides. The front half of the word is usually the substrate, and the organ is the fact you have to add.
Why zymogens? Protein-splitting enzymes would digest the gland that made them, so they are secreted as inactive precursors (pepsinogen, trypsinogen, chymotrypsinogen, procarboxypeptidase) and switched on only after they reach the lumen. Look for the 🔒 in the list.