A prism shows us the color of light and colors gives us information about the frequency of words.
The usage of a same word in different genres would change but a frequent word is a frequent word so I don't think that there would be a big difference
I could use a vocabulary profiler to teach my students the most frequent words by using colors
Yes it is possible, a text can be given to the students and they can find the frequent words in the text by using vocabulary profiler
Wordle is more general, and vocabulary is more specific, I would use a wordle when I want my students to learn general things and when I want them to work specifically, I would use vocabulary profiler