Hi Srikanth,
The Suggestions is the combination of the Worklist entries and the successful entries done in the session. This will show all the Worklist entries.
Save as Tile is the functionality from Launchpad where you can Save a certain screen as a Tile.
For e.g. if you do not want to see the monthly view as the first screen you could save the weekly view as Tile and that will launch the Weekly view directly. This Save as Tile does not makes sense at all the screens but this is to enable the end users to save a certain screen and the launch the app to that screen.
Best Regards
Pankaj