One common synonym for "hazard of die" is "risk of mortality." This phrase acknowledges the inherent danger or potential for death in a given situation or activity. Other synonyms include "peril of passing," "danger of demise," or simply "mortality risk." These phrases are often used in the context of medical or health discussions, but can also be applied to activities such as extreme sports or dangerous work environments. Whichever term is used, the underlying message is clear: caution should be taken to avoid any unnecessary risk of death or injury.