Cruiser (Venator-class Star Destroyer)
Also taken from the description:
The front half of the ship's dorsal surface contained a massive flight deck capable of scrambling the latest in Republic starfighters. The huge hangar doors opened to allow ships to land or takeoff from the deck; the vessel also had a smaller docking bay entrance on its ventral surface.
I suppose that would explain why the ships are pretty lightly armed compared to contemporary Federation and Separatist ships also listed there.
Okay, but that still doesn't tell us what the ships in the end of the movie are, at the Death Star scene.