I am confused regarding the usage of the tags [alternate-realities](https://scifi.stackexchange.com/questions/tagged/alternate-realities "show questions tagged 'alternate-realities'") and [alternate-world](https://scifi.stackexchange.com/questions/tagged/alternate-world "show questions tagged 'alternate-world'"). Is there any clear guidance for their usage? Do we really need both the tags separately?

[alternate-realities](https://scifi.stackexchange.com/questions/tagged/alternate-realities "show questions tagged 'alternate-realities'") is used with 26 questions.

[alternate-world](https://scifi.stackexchange.com/questions/tagged/alternate-world "show questions tagged 'alternate-world'") used with 37 questions.

[4 questions](https://scifi.stackexchange.com/questions/tagged/alternate-realities+alternate-world) have both the tags.

Is it not better to merge both the tags?

---

Note: Tags do make a difference.