In fact, this one already has 2010 and 2011 Meta topics that seems to never have been decided on and I think it's causing some (slight) issues and it certainly needs to be addressed:
Along with it are questions like this one, discussing the proper usage of either cookie or biscuit when discussing the sweet dessert/snack:
In this case, it seems cookie has the definition one would expect (as it's not the word that's ambiguous) but biscuit has no tag wiki... so it gets used on questions about both British and American "biscuits" in the 23 uses of the tag.
There are many such confused tags due to the variance of terminology, as enumerated in the very helpful topic "Translating cooking terms between US / UK / AU / CA / NZ".
As an additional example, pudding has no tag wiki either. Is it for questions about weird (to me) sausages or about milk-based desserts?
If a mod wants to close this as a dupe of one of the questions above, I respect that but I believe it is in the best interest of this site that we make a decision about this and make that decision visible to people who utilize the site. Having questions about cookies under two different tags (cookie & biscuit) helps no one and having two different subjects covered by the same tag (US biscuit and UK biscuit) is pointless as well.
I get that no one wants to push their culture on anyone else but we need to.
My personal preference would be to follow the SE tagging policy:
This keeps the site consistent with the rest of the SE community and makes it so that all tags are clear and have one use. To make this easier for users, any potentially disputed tag should include the non-US terms in the Tag Wiki and mention the appropriate tag to use if they're trying to use in in the non-US sense.
So, the tag wiki for biscuit would read something like
For questions relating to the savory quick bread used in American food. Similar to a scone (UK AU). For the sweet dessert or snack, see "cookie". For digestive biscuits, see "graham cracker".
This is a very rough example and would likely need a lot of work to make it clear.
I'm not sure how many tags need this addressed but I believe that it's something we should work on.
Also, "bread pudding" is not "pudding". So, even in the sense of American dishes, it needs some help.