We have two tags for the word "rival".

Rivals and Rivalry.

I don't know if this has been discussed yet, but one thing to note is that rivalry is the only one with a wiki entry.
Do we continue to use these interchangeably or do we properly distinguish the two?

Rivals is the older of the two, but Rivalry caught on after topic #5593 brought attention to it.

I have to assume that there is no distinction between these two because the former tag has never been brought up in forum discourse before. They're probably one and the same usage-wise, but one would have to double-check.

BUR #37161 has been approved by @evazion.

create alias rivals -> rivalry

I see no distinction.

The bulk update request #37161 (forum #336884) has been approved by @evazion.