I think this issue should be revisited. While I can see there being a reasonable distinction between the two, the use of the chemical-biology tag hasn't really fit its short tag description and it still has no tag wiki. Most of the questions tagged with it seem to fall under two categories (I don't have hard data, but this is my impression looking through the first few pages):
More appropriately tagged biochemistry
Tagged with both biochemistry and chemical-biology (and usually more appropriately biochemistry based on the wiki description).
If it isn't just going to be made a synonym, I think the wiki needs to fleshed out and questions that shouldn't have chemical-biology should have it swapped for the appropriate tag or removed.