are there non-educational flashcards?

Yes, I have one in my camera. (Though I guess sometimes it's educational.)

Now that the phrase "flashcard" has been hi-jacked by electronics manufacturers, I'd suggest making an effort to disambiguate. My suggestion would be to use the word "Quiz" (which is short, unambiguous, and an actual English word... most competitors fail one or more of those: "Edu", "Educational", "Exam", "Examination", "Learning", "Study").

So, possibly App::Quiz::Flashcards, but I think I would go with Quiz::Flashcards (for better or worse, there's already a top-level "Quiz").