You can use the Tridion Docs workflow report to capture the word count for a document. This is useful if your content is translated and you need to provide an estimate to Localization.
Note:
The word count from the workflow report is based on the publication baseline. The baseline includes all objects referenced in the publication, such as topics you reuse from and content that might be excluded from the output using conditions. So the word count based on the baseline can include more words than what’s in the output. This is the appropriate word count to provide to Localization.