Deltiology is a term used to describe the study of postcards. However, there are several other synonyms that can be used instead of deltiology. Some of the synonyms for deltiology include collodion postcard, deltiologist, phillumenist, postcard collector, postcard collecting, postcard exchange, postcard hobby, postcard history, postcard show, and vintage postcard. These synonyms are often used interchangeably and can be employed when discussing different aspects of postcard collection and history. Whether you prefer to use the more traditional term deltiology or opt for one of the synonyms, the study of postcards remains an interesting and important topic for many collectors and hobbyists.