Which word refers to making something stronger?

The word that best refers to making something stronger is reinforce. When we use the term "reinforce," we are specifically talking about the process of enhancing or strengthening an existing structure, idea, or value. It often implies adding support or increasing the solidity of something, whether it's a physical object or an abstract concept. For example, in construction, adding additional materials to a building can reinforce its structure, making it more durable under stress.

While "strengthen" is indeed a synonym that also conveys the idea of making something stronger, the term "reinforce" carries with it the connotation of support and enhancement to what already exists. This makes it a more precise choice when discussing the act of bolstering something that is already in place.