An excellent and free word processor is available in Irish, at the following link:
Note: If you have not downloaded or used either OpenOffice.org or LibreOffice, we recommend that you use LibreOffice, not OpenOffice.org. Since Oracle has apparently decided not to support OpenOffice.org any longer, the open source community has decided to continue development under the name LibreOffice. It is essentially the same product.
There is much more in this package: there is a spreadsheet application, a presentation application, a drawing application, as well as much more.
There are similarities with Microsoft Office (of which Word is a part), but it is not the same thing. Nevertheless, one can read documents in Microsoft Word format, and also save them again in that format, if necessary.