The word "ditch" usually refers to a channel dug on the ground, often used for drainage or irrigation purposes. However, there are several synonyms that can be used in place of this word to add variation to a piece of writing. Some of these synonyms include trench, furrow, canal, conduit, and watercourse. In a more casual context, "hole" or "pit" can also be used to refer to a ditch. Each of these synonyms reflects a different type of ditch or channel, depending on its size, depth, or purpose. Overall, using these synonyms can help make a written work more interesting and engaging.