Marchpast is an important military parade tradition that involves troops marching in unison past a reviewing stand. While the term marchpast is commonly used, there are other synonyms you can use to describe it. One popular synonym is 'parade,' which refers to a formal procession of people or vehicles, and usually includes music and floats. Another synonym you can use is 'review,' which is when a high-ranking officer inspects the troops in a parade. 'Procession' is also a synonym that describes a line of people or vehicles moving forward in a formal ceremony. Finally, 'march' can be used as a synonym for a solemn walk in a parade, usually accompanied by military-style music.