Survey Results Question

Hello,

I am trying to build a survey slide where the user is asked to write a list of specific words from memory. I would like the results slide to tell them the words that they forgot, but not a whole list of all of the words. For example, I want the user to write "cat, dog, fish".  If they type 'cat' and 'dog', I would like the results slide to say 'fish'.  Does anyone have any guidance on where to start?

Thank you!