Best for younger students:
https://www.abcya.com/games/word_clouds
https://www.freewordcloudgenerator.com/generatewordcloud
Options for older students:
https://wordart.com/create
https://www.wordclouds.com/
https://www.k12blueprint.com/blog/michael-gorman/200-ways-use-word-clouds-classroom
https://21centuryedtech.wordpress.com/2012/05/21/108-ways-to-use-word-clouds-in-the-classroom-word-clouds-in-education-series-part-2/
https://primaryenglished.co.uk/blog/10-ways-to-use-word-clouds-in-the-classroom
Word Cloud Alphabet Book