Jeopardy project

I can’t figure out how to resolve the task 4 from the jeopardy project (https://www.codecademy.com/practice/projects/this-is-jeopardy )
I have done the filter function witch it returns rows that have the substring I looking, and not only the rows witch contain only de words I am looking for. For example. return row that contain the word kingdom when I only want the word king.
Can you help me please?

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