The term "double-action harrow" is a type of harrow used in agriculture to prepare soil and remove unwanted materials or weed from fields. However, there are other terms that can be used interchangeably with "double-action harrow", such as disk harrow, plow harrow or cultivator. Disk harrows are made up of sets of notched circular plates that help break down soil and remove weeds, while plow harrows are used for tilling soil and are fitted with sharp plow blades that dig deep into the ground. Cultivators, on the other hand, are used to loosen soil and prepare it for planting. All of these terms refer to tools that are vital to farming and soil preparation.