A family of Microsoft word processing software products for creating web, email, and print documents.
There is no free Word or Office for installation on a Windows computer.
The closest was Offfice 2010 starter which was not really free but was bundled with many computers.
You can use the Word online app for free. You would need to get a free OneDrive application to store documents.
https://www.office.com/launch/word?ui=en-US&rs=US&auth=1
You can get the free LibreOffice program which makes compatible files. It is a good, free, office suite. It is not the same, but it is good.