There are several synonyms for the term "Winterkilling." The foremost one is frost damage, which refers to the harm caused to plants, crops, or vegetation as a result of extreme low temperatures. Another term you can use in place of Winterkilling is freeze damage, which is used to describe the injury or death of plants due to freezing temperatures. Winter dieback and cold damage are also excellent synonyms for Winterkilling. Winter drought and winter injury are other terms you can utilize when referring to Winterkilling. In summary, there are several synonyms for the term Winterkilling, each of which can be used interchangeably in the appropriate context.