You can add virtual gold, digital gold, and BTC to the list. All of it is just the same, and it all works to describe bitcoin, it doesn't really matter a lot what are you going to name bitcoin since its all correct but I would pick the Digital currency or Virtual Currency since it was made as a currency that you could use virtually or online. A way to make a transaction online or on the internet.

I think the cryptocurrency name is a little broad because cryptocurrency could also refer to other alternative cryptocurrency like ETH, XRP,, and BNB, etc. The way I look at it is, Bitcoin is a cryptocurrency, and all the altcoins as well, so they are all cryptocurrencies. I mean if you compared it to Ethereum that have a different purpose it might become a digital currency as well since you could send it to someone or use it as a payment I suppose but it wasn't its main purpose. I guess people just easily assume its Bitcoin because a lot of people only know about bitcoin and doesn't really know anything about the other cryptocurrencies other there.