Welsh Word Bank
When will the Word tab be available for Welsh?
There is a way to do this right now.
Close your tabs, except for one with Duolingo on it. Switch your language to French (or any other language with the Words tab). Keep this tab open.
Open up a page with your Duolingo profile on it in another tab. Switch to Welsh.
Go back to the tab with French on it. Click, on the French page, the "Words" tab.
Because you switched your language to Welsh, Duolingo will register your language, for all the pages you then go on, as Welsh. If all works, and it usually does, this words tab will be for Welsh.