Is there a widely accepted "single word" for referring to a cryptocurrency enthusiast?
Afaik , there is no "single word" expect the ones you mentioned.
Have you seen any other such word?
I saw users here in btt forum using the word "bitcoiner" as well as "Blockchainer" , or "Crypto-fan" which is more expressive. I prefer using the simple term "Crypto Enthousiast" or "Crypto-enthousiast" to define myself.
BTW , why are you looking for those concepts ? You can use your creative imagination to create new ones . Good luck anyway .