Hmmm...worked for me:
https://www.backyardchickens.com/articles/glossary-definitions-of-common-terms-for-raising-backyard-chickens.47687/
But neither 'Thread Starter' or 'Original Poster' is listed.
Which to use is a tossup...
'Thread Starter' is/was commonly understood here before the change...
It's pretty easy to check a members activity, I often do that.
Both posts and threads started.
Right click on post count and open new tab ...
...or left click on avatar and right click open new tab on 'topics started'.
At least on laptop it's easy....great tools.
The more I see this the more I love, love, love it!!
It's going to make longer thread discussions diversions SO much easier to navigate and help the OP... or rather TS.