There was a question about the difference between cryptography and cryptology. Even if there is a positive answer: there is a difference then I think the difference is too small; almost nobody in the community will understand the difference. Tagging questions with cryptology will therefore only spread confusion.
The only tag where it makes sense is the singular question about the difference. Although the question in itself is fine, I propose to burninate the cryptology tag; having a single-use tag is - well - useless.