Since this doesn't look to be 'sensitive' data, if you post the data file we'll be better able to help you structure it correctly. In the meantime look at the CONTAINS() function if you're set on doing it in Tableau, but it might be better to do it pre-Tableau.
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Yep, if this is a one time (or low frequency thing for you), there are a number of websites that will take text and produce a word frequency chart that you could take into Tableau.
Thank you to Alex and Shawn