This might be a bit off-topic, or it might be something useful ...
If you are looking for a word-test game for students that is like a word-square the you should look at "
Waffle". This is a newish game in the UK (where Wordle was invented). It is built from six five-letter words arranged in a square, like this ...
I mention it because it is similar to a word-square but more approachable as it can be much more easily built from well-known words. If you want something interesting to attract students of English then this might be more acceptable. Not sure if it would expand to seven-letter words.