Hi again Olga,
2.- You wrote ""essay" - is a great tool for small student-produced texts but as a teacher I can only see the score and can't see the student's text."
That is not true, a teacher can review the students' submitted H5P essays in the Attempts report.
3.- I have entered your list of words in a Find the Words H5P activity and it works fine. Please explain clearly what you meant in your original post by "the upper line and the left side column in the square are impossible to mark the words etc." Are you using H5P & Moodle in a browser or on a smartphone/tablet with the Moodle Mobile App, by any chance? I am attaching a screenshot of my own trial, no problem reported.