Crypto = cryptocurrency. Cryptography = cryptography. We may not like it but the public has decided and there's nothing we can do to prevent it.

Crypto still just means hidden or secret though. Both sides here probably ought to increase their specificity by one level.

Interestingly, r/crypto is the cryptography subreddit and has https://www.reddit.com/r/crypto/comments/7jrba2/crypto_is_no... stickied.