I was trying to write the wiki excerpt for the etymology tag, but I couldn't find any "create tag wiki" or something similar like I did with another tag... Is there a reason for this?
1) I agree we should merge these. I am not sure anyone yet has the tag rep to suggest a synonym yet. On English.se I think we generally chose to use the plural versions of tags like this as the main tag and make the others synonyms of that - we might consider doing the same here.
2) When you click the etymology "help us create it" link, currently, and it goes here, at the bottom I see that there is "edit pending" instead of the "edit" link. My best guess is that this blocks others from editing until someone handles the current suggested edit. I think it requires 1500 rep to approve these edits so you are close :)