Catsup, a condiment typically made from tomatoes, can be referred to by several different names. Some common synonyms include ketchup, tomato sauce, tomato ketchup, and tomato dip. While these terms are often used interchangeably, they can sometimes have slightly different connotations depending on the region or brand. For example, some people might use the term ketchup to refer specifically to a certain brand or variety of tomato-based sauce. Overall, whether you call it catsup or ketchup, this condiment is a well-loved addition to burgers, fries, and many other dishes around the world.