Rugby and American football are two completely different games. Americans refer to rugby as rugby, and American football as football.
Rugby is a football code, so there is no difference. However, it is different from other football codes:Association football: the hands cannot be used, and goals are used instead of scoring zones.American football: the ball can be passed forward, and rules regarding the post-tackle situation are different.Gaelic football: several alterations in the goal, and methods of scoring and playing.------------------------------------------------------------------------------------------------------------In Rugby game each team has 15 players, but American football has 11 players. additional point, in American football players always use pads protect themselves but Rugby players don't use this!
Football
Association football (Soccer), Five-a-side soccer, Gaelic football, Rugby League, Wheelchair rugby,Freestyle football, Rugby Union, American football, Canadian, Australian football, Subbuteo, Table football and quite a few more.
Basically they are 2 very different games
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football was a sport with many variations, each school had there own version of football, oxford football, cambridge football, ect. rugby football was football from rugby school in the town of rugby, when students went to university after they left school they took their versions of rugby with them and rugby came out of this, this was back in the 1850's when this happened and from there the sport of rugby football spread to different countries, the split between the two codes came in the early 20th centuary when workers who played rugby football demanded pay for broken time when playing rugby football when they could of been at work earning money, many clubs wanted to stay amature as a game but some clubs resisted and split from the rest to form the northen leage, this became rugby league. the rugby union stayed amature untill 1995 when the game turned proffessional as it was attracting a worldwide audience and it couldn't stay amatue.. there is your basic history of rugby any questions?
In general those that follow union or league know the difference.
Rugby originated from soccer (football)
No they all meet the requirements of both codes.
Australian rules football (commonly locally called "footy" and which is vastly different from English football, rugby league, rugby union, or American football) is considered Australian because it was invented and developed in Melbourne, Australia.