So your first common ancestors are your great great grandparents, so that’s third cousin, and they’re a generation older than you, so once removed. Third cousin once removed.

I believe that the answer is second cousin once removed.

I believe you need to count the distance to the common ancestor from the older generation of the two people being related.

I agree that the first common ancestor is OP’s great-great-grandparent. But only OP’s relation’s great-grandparent. So OP’s parent and OP’s relation are second cousins.

Then the removed takes you down the tree from OP’s parent to OP.

I could be wrong, but my impression is that there is less politics and less bias involved in defining words and and providing pronunciations and etymologies then there is an articles about history and politics and people.

I especially like Wiktionary from the point of view of exploring cognates between languages and etymologies that cross language boundaries, in a big dictionary that covers many languages all at once.