Finnish would like a word. Take a random noun like kauppa "shop". It has at least 6000 forms: https://flammie.github.io/omorfi/genkau3.html and that's excluding compounds (written as one word in Finnish) like "bookshop" or "shop-manager" etc. etc. And then you have loan words and slang, derivations into other words classes; all of this is impossible to compactly represent in a full-form word list.

Now consider the many other languages of that family ( https://en.wikipedia.org/wiki/Uralic_languages ) – they also have this extreme potential for inflections, but next to no online resources to train language models on or even scrape decent wordlists from.

Finnish is very different from most other languages, and does not have the user base to be well represented in training data, but that webpage is ridiculous and does not reflect the actual language. No one in the history of Finnish has ever spoken most of those forms. Grammar describes language, it does not define it!

"would like a word". I see what you did there...