There are several synonyms for the word "impounder," including "seizer," "confiscator," "repossessor," and "detainer." These words all refer to someone or something that seizes or holds onto property or possessions. "Impounder" is often used in the context of animal control, where it refers to the person or agency responsible for capturing and holding stray animals. However, it can also be used more broadly to describe anyone who takes possession of something, often as a result of legal action. Regardless of the context, the synonyms for "impounder" all convey the idea of taking possession of something, whether through force or legal means.