We have found one software suitable in our database for this conversion.
You cannot directly convert Numbers spreadsheets (.numbers) to Word documents (.docx) files. At best, you can find some work around that will allow you to copy and paste the tables from the spreadsheet to your document, but this may require some knowledge and post formatting.
Some online conversions supposedly support this conversion, but the results may not be what you were looking for. In most cases it will be just tables put directly in the document without any formatting.
NUMBERS
Files with numbers file extension can be traditionally found as spreadsheet format of Apple Numbers application on Mac OS X (macOS), iOS and as web service. Numbers spreadsheets can only be opened in Numbers app, there is no 3rd party program available that can open or convert it to another format.
DOCX
Files with docx file extension are documents written and saved using Microsoft Word word processor edition 2007 or later. DOCX format replaced the previously used DOC format, moving from binary files to Open XML schema-based documents. They are supported in almost every modern word-processing tools.