Shellburst is a term that is commonly used to describe the explosion of a shell or missile in mid-air. There are several synonyms for the word shellburst, including detonation, explosion, blast, burst, and eruption. The use of these synonyms is often dependent on the specific context in which they are being used. For example, the word detonation might be used to describe the controlled explosion of an explosive device, while the word eruption might be used to describe the sudden and violent explosion of a volcano. Ultimately, the use of synonyms for shellburst allows for greater precision and flexibility in language.