Word: 'Give all nouns that appear >X times' not working as expected

Hi!

When using Copilot in Word, I tried several iterations of the question 'Give me all nouns that appear over 6 times. Provide your information in a table and include the number of times the noun occurred'. 

Copilot provided a nice table, but it was not complete by far. The document was under 7500 words so that should not have been the issue.

What prompt should I use to achieve my goal? Anyone any idea?

I want to put repeating input fields in the document and wanted to see for which words/terms this would be worthwhile, which is why I was hoping Copilot could provide me with a quick overview of repeating terms.

Thanks,

Merel