Aren't spotters and enthusiasts two different things? Or are the terms interchangeable really?
Yes they are different, there's lots of different types of enthusiasts, with some crossover:
Spotters: Interested in spotting and 'Photting'
Bashers: Interested in mileage and riding behind certain traction
Gamers: Those that like playing rail sims
Modellers: Interested in railway modelling
Supporters: People that like railways, but interest is limited to membership of some sort of group like Rail Future or a preserved railway
Preservationists: Those that are interested in preserved railways and heritage
Bookworms: Those that just buy magazines and books
Photographers: Interested in getting railway videos or photographic content, usually for art based reasons rather than 'photting'
Artists: Painters or railway art, or interested in design/railway architecture.
You also get people who like steam, with no interest in modern railways, and those that like modern and nothing to do with anything pre-1970.
Most people do one of those above, prominently and maybe a few other interests like reading the odd magazine and visiting the odd preserved railway.
Some people will just have something to do with a preserved railway and have nothing whatever to do with modern trains, not even travelling by public transport. I know several people like that.
Others will enjoy spotting and never touch model railways and so on.
We are a very diverse bunch from all walks of life and are certainly not all 'spotters'.