A majority of the questions tagged with tiles (27 questions) appear to be about the live-tiles (42 questions) introduced in Windows 8.
I don't think the tag should be added as a synonym, since "Tiles" could be referring to a few different things. (Apache Tiles, Tile Bluetooth Tracker, Tiles Tab Manager,
Floor Tiles, etc.)
The tiles tag should be burninated. Any relevant questions should be retagged as live-tiles