Free Word Processor macOS High Sierra or earlier

See the following from https://www.libreoffice.org/get-help/system-requirements/

• LibreOffice 4.3 can still run on OS X 10.6+, but please understand that this support ended when 4.3 was retired on May 27, 2015.

Old versions of Libre Office can be downloaded from https://downloadarchive.documentfoundation.org/libreoffice/old/

Also, Check to see if you have Apple Pages. It might have been pre-installed on your Mac.

the bad news:

download older version of pages for Mac - Apple Community

summary: not unless it is already downloaded it previously.