Libreoffice is an App by now and does not include a direct swriter link anywhere in the system. The easiest thing to do (so you also have the shortcut for Spotlight) for me was to create a shellscript that starts the libreoffice writer:
#!/bin/bash

Once you save your newborn Application into the Application folder (in my case under the name Writer) you can start it by using Spotlight, or any other method you may choose.