In most word cloud generator, you dump in the text and it spits out the word cloud. if you want to create something as a phrase, many have the option if you use a "_" between the words. Easily done with a find/replace option. You can eliminate words from the picture if you want.
I use www.wordle.com a lot on big papers and sometime audio transcriptions to get a general feel for the material. Doesn't replace reading but does set a tone that I have found to be very helpful.