Calotype is a term used to describe a photographic process that was popular in the mid-19th century. It involves using a paper negative to create a positive print. While there are no direct synonyms for the term, there are related words that can be used to describe the process. Some of these words include paper negative, salt print, and Talbotype. These terms are often used interchangeably with Calotype, and all describe a similar photographic process that was used in the early days of photography. Despite being somewhat outdated, the Calotype process remains an important element in the history of photography and continues to be studied and practiced by photographers today.