I'm using lists with declined nouns and conjugated verbs, so you should see the more common declensions/conjugations earlier.
Do you also detect word types? I.e. "Der Mann" (nominative masculine article der) vs. "Das Haus der Frau" (genitive feminine article der) [German] or "að leita að" (infinitive marker að vs. prepositional að) [Icelandic]
At the moment Pro users can play sentences grouped by missing word part-of-speech for German, Spanish, French, and Italian from English. I've tried a few different approaches to determining the word types / part-of-speech of words in a given sentence, but none have been super accurate so far. There's definitely a lot more fun/interesting stuff I'd like to do with Clozemaster if I ever do find or develop a good way to detect types.