I've always considered crypto as a form of digital currency. I'd say keep them under one roof. In fact this might even cause more confusion from a newbie's perspective.
True, cryptocurrency is kind of digital currency. There are a lot of things that considered as digital currency even it not related with fiat, Like mobile pulse, In game currency, etc. If crypto i can't describe it really detail.
Crypto is a part of digital currency. I think there are lots of explanations and parts of digital currencies. We don't need to worry about explaining it because the most important thing is now digital currencies and including crypto are in a very good development process. We only need to maintain and we will reach the era of digitalization that is so good in the future.