If you could still singularly purchase MS Word, it would likely cost almost as much as the Office suite. I see for a limited time, you can get Office 2024 Home and Student for $129.97 at StackSocial. You can perform a custom installation that only installs Word. This is where I got my Office 2021 Home and Business for $34 two years ago.
You already have the Microsoft free Web apps link from Servant of Cats.
If you are sharing Word documents with other Word users, I would not recommend using Apple's free Pages application as it may introduce content issues for Word document recipients. Word documents with equations exported from Pages drop those equations when the Word document is opened in LibreOffice, but not in MS Word.
If you are accustomed to using MS Word, then you will find that the free LibreOffice is largely compatible with your existing documents, but the user interface and learning curve will be steep, even with the well-written LibreOffice documentation for support.