I don't know why they separate them like that. A pullover is a sweater that you pull over your head. Some of the patterns on the sweater list are pullovers, too. Maybe they just didn't want to have a super long list and divided the patterns with pullover in the title. But, then again, the first sweater pattern is called a pullover, but there are lots of different styles on the sweater page.
Here are some great sweater/pullover/jumper patterns, too.