Do you need to adjust a reading passage for different levels of learners? Check out Rewordify (https://rewordify.com/) Rewordify will allow you to paste in a text selection and it will change key vocabulary to make it easier to read. It does more than just replace the words though, it highlights the words it replaced and if you hover over the replacement word, it will show you the word it replaced. Excellent for bridging to new vocabulary for students.