The person who writes the checks is often referred to as the "check writer" or simply as the "payer." However, there are a few other synonyms that can be used to describe this role. One common term is the "account holder," as they have the authority to withdraw funds from their bank account and issue checks as needed. They may also be referred to as the "signatory," as their signature is required on each check they write. Additionally, they may be known as the "check signer," "paymaster," or even "treasurer" if they are responsible for managing finances for an organization or group.