There are differences in meaning, emphasis, and usage.

1. Meaning: Enthusiasm refers to the love and enthusiasm for something. This enthusiasm can be for people, things or things. Enthusiasm, on the other hand, emphasizes the psychological state of sincerity and enthusiasm, which can be love for people or things.

2. Emphasis on key points: Enthusiasm puts more emphasis on external performance and actions, that is, active investment and dedication to something or someone. Enthusiasm emphasizes inner sincerity and enthusiasm, that is, sincere love and enthusiasm for something or someone.

3. Usage: Enthusiasm is usually used as a noun to express love and enthusiasm for something or someone. For example, he was passionate about music. Enthusiasm is usually used as an adjective to express sincerity and enthusiasm. For example, he is passionate about his work.