In his Mastering JMP session on using text analysis to derive sentiments from opinions or product choices, Mike Anderson shows how to change the Word Cloud from displaying word stem (shown on Word Cloud with a dot after the word) to whole word.
There are 2 ways. 1) From dotted word in Word Cloud, R-click and select Add Stem Exception. 2) From list of options below the Term and Phrase List, choose Add Stem Exception. He also explains that if you have JMP 14 but don't see the list, add list from the Text Explorer red triangle, Display Options>Show Term and Phrase Options.