The MS Office version (is not "word") involves online storage and those options
may not be available to the older OS X system; also this utilizes bandwidth to
upload & download files, so that may be slower than expected or not work at all.
An older version of Word that may run in the computer's system may be a better
bet. Or see if there still are Google Apps that may work (in TenFourFox) to include
a word processor. There were a few fine word processors that run free, you could
get as a download and install. One was Bean. Another with greater potential in
other ways (as system editor, to implement command-line or code, etc) is Text-
Wrangler. Also TextEdit that is already in the system does OK, while not offering
the fine properties of the earlier Word application. AppleWorks was OK, but huge.
•TextWrangler is a bit advanced, since it can be used for more:
http://www.barebones.com/products/textwrangler/
•Bean (note older version downloads for Tiger 10.4+, not the latest one in main link)
see download Bean 3.1.1 for PPC Mac for 10.5+ AND older: Bean for Tiger 10.4+)
http://www.bean-osx.com/Bean.html
Another software that bridges the gap between Apple's TextEdit and a word processor
is this product known as Tex-Edit. It will run free, but is shareware. See Maker's page:
http://www.tex-edit.com/
Anyway, if you have online storage acceptable to Office or Google Apps, then the
resulting documents saved to the internet may be OK; however they're accessible
only with an internet connection. And subject to loss in several ways.
An ideal vintage version of of Word, if you had a copy, was MS Word 5.1a.
Good luck in this matter & happy computing! 🙂