The phrase "together with" can be used to indicate the combination of two or more things. However, there are several synonyms that can be used interchangeably with this phrase, including "alongside," "in addition to," "coupled with," "jointly," and "in conjunction with." Each of these phrases can be used to bring attention to a collective output and a combination of elements forming a whole. They can also add emphasis to the importance of multiple factors working together to create a positive effect or outcome. By using these synonyms, you can add diversity and variation to your writing while conveying the same intended meaning.