Reinforce is a commonly used word that means to strengthen or support something. However, there are several synonyms that can be used in place of this word, depending on the context. For example, the word bolster can be used to mean to reinforce or support something by adding extra strength or stability. Another synonym is fortify, which means to strengthen or amplify the effectiveness of something. Additionally, the word buttress can be used to mean to reinforce or support an argument or statement with evidence or additional information. Other synonyms for reinforce include enhance, cement, solidify, and underpin, among others. By using these various synonyms, writers and speakers can add nuance and depth to their language, making their communication more effective and impactful.