Whoomph is a word that is commonly used to describe a sound or action that is sudden and explosive. However, there are several synonyms for whoomph that can be used to add variety to one's writing. Some common synonyms for whoomph include boom, thump, bang, thud, and crash. These words convey a similar sense of suddenness and impact, but each has its own unique connotations. For example, a boom might suggest a larger and more powerful explosion, while a thud might suggest a softer impact. By using a variety of synonyms for whoomph, writers can add depth and richness to their descriptions of sudden and explosive events.