On could make a case that "history-of-terminology" is for questions of the historical development of terminology or old terminology while "terminology" would be about current terminology, and could be used in questions that concern history of science as a current discipline.
However, making such fine distinctions is not very useful in my opinion. Mainly, since in practice it is hard enough to maintain some basic standards of tagging throughout the site, and subtle distinctions worked out in theory can all too rapidly be blurred beyond recognition by imprecise usage in practice.
I am in favor of having one tag "terminology" for all things terminology. At least for now. Once we have 20 or 30 question with it, we might check if we want to split the tag.
The tag "history" is way too broad, I agree. I think we might even ask for it to be an intrinsic tag of the site. This would mean it cannot be created, but is accepted when questions are migrated here (which is not yet relevant though).