Wordle is a resource that creates a word cloud by analyzing an input text. A teacher can copy and paste a text into Wordle to create a dynamic word bank. Words that occur most frequently in the text appear larger in the word cloud. Those appearing less frequently in the text appear smaller in the cloud. This powerpoint has a few flaws, but gives some great ideas about how to apply this technology to the classroom.
This video shows a bit more about how to use Wordle.
Thank you, Youtube user JYang628!