Ok, you've got:
Association Football (Association -> assoc -> Soccer)
Australian rules football
Gaelic Football
North American Football (Breaks down into Canadian and American Football)
Rugby Football (Breaks down into Rugby League and Rugby Union)
They are all known as Football, as they're all played on foot, rather than sitting on horse playing something like polo
It all makes sense now. I never thought it did because in most of these sports you don't actually kick the ball with your foot.
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