From a disciplinary perspective, marine science and oceanography are effectively the same; though marine science tends to incorporate more aspects of marine biology and marine ecosystem science than oceanography, which tends to incorporate more aspects of physical and chemical ocean processes.

It's typically divided into four sub-disciplines: physical oceanography (the study of waves, currents, tides and ocean energy); geological oceanography (the study of the sediments, rocks and structure of the seafloor and coastal margins); chemical oceanography (the study of the composition and properties of seawater ...

If you want to include graduate school, then University of Washington ranks as the top School of Oceanography on the planet.

While oceanographers study the oceans themselves—the chemistry, physics, and geology of ocean systems and how organisms shape these systems, marine biologists study marine organisms—their characteristics, physiology, and life history. Oceanographers study the conditions of our planet's oceans.