Puzzles based around words and/or text are most often the most educational and therefore most interesting to the biggest group of users within Puzzel.org
Word puzzles can be used to ask questions in a playful way by integrating them in all sorts of puzzle field grids.
Try out the different word puzzle generators and see which one suits your goals the best!
If you do not feel like creating a word puzzle yourself around a certain theme, you can try out the text-based AI integrated within Puzzel.org
There is the 'Answer & Description' AI for generating a list of questions and answers based on a theme + difficulty level that you can input.
And for language education it has the Translations AI for generating a list of words + translations based on a theme. You can pick the input and output languages yourself to get the ideal word-based activity.
Build your own online hangman game with your own set of words.