The phrase "heel over" is commonly used to describe a boat leaning to one side. However, there are several other synonyms that can be used to convey the same meaning. Some of these include "list," "capsize," "tilt," "lean," "roll," and "tip." Each of these words can be used interchangeably with "heel over" to describe the motion of a boat moving to one side. Additionally, these synonyms can be used in a broader context beyond just describing boats. For example, one could say a building is tilting or a person is leaning to one side. By using these synonyms, writers and speakers can add variety and depth to their language.