The word "kerplunk" is often used to describe a sudden, loud sound of something falling or hitting the ground. However, there are several other words that can also be used to convey a similar meaning. For example, "thud" is a common synonym for "kerplunk" and is often used to describe a heavy object hitting the ground. Other synonyms for "kerplunk" include "plop," "plunk," "clunk," and "thump." These words all describe the sound of something falling or hitting a surface and can be used interchangeably with "kerplunk" in most contexts. So if you're looking for an alternative way to express a sudden, loud sound, consider using one of these synonyms instead.