As for any differences in rules between soccer and ( Association) football, the answer is that there are none. Both refer to the same sport featuring 22 players described above and adhere to rules...
The Similarities between Football (American Football) and Soccer are: Both American Football and Soccer have 2 opposing teams with 11 members each; Both are contact sports; Both games allow substitutions, although the numbers are different. Both the sports have goal posts, although they are of different dimensions.
The answer is one that heavily depends on where you live. Certain parts of the world would regard soccer and football as the same thing, but for others, it is two different things entirely.
The answer is quite clear as soccer and American football are two completely different games. Soccer is played with a round ball that can be kicked and headed. American football, however, is more of a rugby type game in which the oblong shaped ball is thrown and passed as well as kicked.
Soccer is a game beloved from South America to Europe, from Africa to Asia. At its simplest, it involves a foot and ball. But in the United States soccer can involve much more than that.
Soccer is called Association football, or more commonly simply football in most of the world. In America, the word football refers to American football, which has more in common with rugby than with soccer.
In the United Kingdom, the terms football and soccer refer to the same thing while in United States, soccer and football are two different games. The football there is more like the rugby and the players wear the armor to protect themselves from getting hurt. And in soccer, the teams use the feet to kick the ball around, and do not wear any armors.
Both soccer-style football and rugby-style football eventually found their way to America. … So because the American game was really just another form of the European football games, it too became known as football. Who invented soccer? Modern soccer was invented in England around the 1860s when rugby was detached from soccer. However, the earliest forms of soccer are recorded in the second century B.C. in China during the Han Dynasty, where an ancient form of soccer was Tsu Chu was played.