If you comment out the word and wordopenxml rendering engines in the reportserver.config there will no word rendered.
<!-- <Extension Name="WORDOPENXML" Type="Microsoft.ReportingServices.Rendering.WordRenderer.WordOpenXmlRenderer.WordOpenXmlDocumentRenderer,Microsoft.ReportingServices.WordRendering"/> -->
<!-- <Extension Name="WORD" Type="Microsoft.ReportingServices.Rendering.WordRenderer.WordDocumentRenderer,Microsoft.ReportingServices.WordRendering" Visible="false"/> -->
I just did it on a dev server and 23.2 and 24.1 were both unable to render a word doc.
You get this in the system monitor
The Microsoft SSRS service does not support any of the following formats: WORDOPENXML, WORD.