Look at this website
for a comparison between a Nimitz-class carrier and the Freedom Of The Seas. Don't confuse GRT with actual weight. The Nimitz displaces 97,000 tons and this is different than a GRT (gross registered ton), which is a measure of volume.
Essentially, both ships are about as long and about as wide except for the flight deck. The big thing is the draft, the more the better in rough seas. In the case of the Nimitz, that 37 feet of draft also includes a good part of two really heavy reactor plants. Another thing is cruise ships have stabilizers and carriers don't.