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I would split my text on a \s (whitespace) with the text to columns tool (split to rows). Then make every single word lowercase (or upper case). Use the Regex tool or the Data Cleansing tool to remove unwanted characters. Summarize on word count and then use a sort descending on this field. After that you can use a sample for the top 10.
We have done some similar analysis. Another cool view is to use a Multi-Row Formula once you have the keywords to look for common word pairings. Due to my organizations policies I can't upload my workflows but the expression to combine the words is "[Keywords]+"~"+[Row+1:Keywords]" this will add a tilde ("~") instead of a space between the Keywords.