As a bonus is an expression that means "in addition to" or "as an extra benefit." If you are looking for alternatives to this phrase, you can use other expressions that convey the same meaning. For example, you might use "on top of," "in addition to," "besides," "furthermore," "moreover," or "not only that." These phrases can be used in a variety of contexts, such as when you want to highlight an extra benefit or added value to something. By using these synonyms for "as a bonus," you can diversify your writing and communicate your ideas in a clear and concise way.