Can the asker enter in the glossary a term different from the one suggested in the selected question?

 Yes. Points are (or should be) given to the most helpful answer, while the best possible term should be entered in the glossary, even if it was not suggested by the answerer who won the points.

Imagine for instance that you ask for a difficult technical term and get several similar alternatives, but one of the answers provided a very clear explanation that helped you understand the meaning of the term and its usage. Then you could pick another of the alternatives, and still consider this the most helpful answer.

It is also possible for askers to find the best term on their own and enter a term that was suggested in none of the answers provided, but still select a most helpful answer.