The phrase "synonymous with" expresses the idea that two things are closely associated with each other, to the point that they are essentially interchangeable. Synonyms for this phrase include "identified with," "linked to," "inextricably connected with," "inseparable from," "conjoined with," "intimately tied to," or simply "associated with." When describing something as being "synonymous with" something else, it conveys a strong and definite connection between the two, often implying that they share important similarities and cannot be easily separated from each other. In summary, synonyms for "synonymous with" can help to better articulate the close relationship between two things.