Currently, the only way to sort a Glossary is by chronological order. This sort can be either by "Last update" or "By creation date". While this can be useful, it is also useful for sort by other fields.
For example, if the teacher wants to review the entries by a particular student, it would be useful to sort by author. This can be very, very helpful if the teacher has asked students to post a certain number of concepts.
Alternatively, let's say that a teacher has challenged the class to define a specific concept. The teacher will then approve the "best" definition of the concept. Being able to sort by concept would make this much easier. (Yes, you can limit concepts by a specific letter, but even these are not in alphabetical order, they are in "update" or "creation" order.