Getting the Words tab and Flashcards for Irish
(Update - since the website was updated in June of 2017, there is an extra step necessary to use this workaround - you must select the Discussion button on the French page before you switch to another tab to change the language to Irish - if your French page is displaying the "Home" content, the Words button will not display the Irish Words list)
From time to time I've read posts that explain how to get access to the Words tab in languages that don't have it, but it hasn't worked for me before. I don't know if I didn't follow the instructions properly, or if some recent tweak has made it more straightforward, but this post prompted me to try again.
I simply added French as a new language, then selected French as my current language (by clicking on the flag icon next to my username), clicked on the Discussion button, then I opened a second Duolingo tab/window, changed my language back to Irish in that second tab (by clicking on the flag icon next to my username), and then went back to the first tab (which is still showing the French flag, and the "Words" button) and clicked on the "Words" button, and there it was:
The Flashcards work as well:
2327 words. I still have a long way to go :) (at 469 atm) sadly "words" disappeared when I tried this method. I am using duo tweak script on another device to enable it for Irish, thought I'd try this on my mac, but it disappeared. Duo Tweak doesn't work on my mac either.
You can see from the screenshot that it includes some eclipsed forms of words, and probably some plurals. I'll have to sort through them over the next few days and see if I can figure out how many base words there are actually are on the list.