Mail-order house refers to a company that sells products by sending catalogs or brochures to customers through mail. However, there are several synonyms for mail-order house, including catalog retailer, direct marketer, distance seller, and remote vendor. While mail-order house may be the most commonly used term, these synonyms are often used interchangeably. A catalog retailer is essentially the same as a mail-order house, as they both utilize catalogs to showcase their products. Direct marketer and distance seller both refer to selling products directly to customers without a physical store location. Remote vendor is a more general term that includes any company selling products remotely, including through the internet.