The key concept is the substrate: the physical support carrying the light-sensitive coating.

Notable analog capture substrates include:

• paper — used in early processes such as the calotype
• metal — including tintypes, and also silver-plated copper in daguerreotypes
• glass — e.g. wet collodion and other plate processes
• film bases — flexible transparent supports used for most modern film, including early cellulose nitrate, later cellulose acetate (“safety film”), and polyester

So if your site is classifying image-capture media, a practical top-level list would be:

• paper
• metal
• glass
• flexible film

Then you can break flexible film down by base if needed: nitrate, acetate, polyester.

Also note that photographic paper is commonly used for printing rather than in-camera capture, but historically paper was also used as a capture medium. Beyond that, artists can coat many surfaces with emulsion, but those are niche/special-case uses rather than mainstream photographic capture media.