The word "convectional" refers to something that relates to convection, which is the transfer of heat or other properties through the movement of fluids like air or water. Synonyms for convectional include thermal, circulatory, migratory, and current. Thermal refers to something that is related to heat, while circulatory refers to something that moves in a circular or flowing manner, such as air or water. Migratory refers to something that moves from one place to another, while current refers to the direction of flow of water or air in a particular area. These synonyms can be used interchangeably to describe something related to convection in a wide range of contexts.