Oceanographer. noun One who studies the branch of physical geography dealing with the ocean.
Limnologist. noun One who studies bodies of fresh water, such as lakes and ponds, with reference to their physical, geographical, biological, and other features.
Bugfuhg crazy OCD amazingly virile orc what ain't right in the head an' has way too much fluggernubbin' time. noun One who flies all overs Azeroth an' beyond fer ta get both achievements in a day.