Rennin, helicase and hyaluronidase are all enzymes. Rennin (chymosin), secreted by the stomach is responsible for clotting milk. It acts on a soluble milk protein (caseinogen) to converts it into the insoluble form casein. Helicase unwinds double stranded helical DNA during replication. Hyaluronidase is able to digest hyaluronic acid (major glycosaminoglycan) and is therefore important in modulating the removal of cell matrix in order to facilitate cell movement or tissue organization.
Thiamine is not an amino acid, it is vitamin $B_1$, which is active in the form of thiamin pyrophosphate, a coenzyme in decarboxylation reactions in carbohydrate metabolism. A deficiency of vitamin $B_1$ leads to beri beri.
Myosin is a contractile protein found in eukaryotic tissue, interacts with actin to bring about contraction of muscle or cell movement. Among optic, oculomotor and vagus, which are cranial nerves, optic is sensory in nature, oculomotor is motor and vagus is mixed sensory nerves