Indeed these two concepts vary on a very fundamental level and the one can do without the other. But not going into crypto or blockchain definitions, as you can find those across so many credible web resources, however, the point of blockchain is to secure, to some extent decentralize, and make irrefutable evidence of transactional activities. On the other hand, cryptocurrencies are needed for tokenization and reward implementation systems. I'd give a very good example.

Hinounou, a very new wellness project wants to blockchain wellness data and system through AI, while providing incentives for its consumers - the aging population. I quite like the concept and have recently become a fan of the project; in that, the blockchain aspect of the project helps to distributed quality information about the aged citizens' health data across research institutes, pharmaceutical firms and other medical related industries, oh, as well as insurance firms. The aim is to prevent chronic illness by detecting early signs through special robotics... Okay, you can read up the rest yourself, however, consider that the tokenized aspect of the project (the cryptocurrency) works to incentivize 'seniors' to live long healthy lives and be supported by an income.