Floodmark is a term used to refer to the highest level reached by a body of water during a flood. There are several synonyms that can be used to describe this term, including high-water mark, flood level, flood stage, and crest. These terms are often used interchangeably in weather reports and news articles to describe the severity of flooding in a particular area. Knowing these synonyms can help people better understand the potential danger and impact of flooding in their local area. Overall, understanding these words can help individuals plan for potential flooding and take measures to protect their property and loved ones in the event of a flood.