They are related in the foundations of the two sports. American football is derived from the sport Rugby.
Both Rugby and Soccer are related as there was a disagreement on the set of rules which was going to be created (around 1863). This led to a split in the original committee into the Football Assosiation (otherwise better known as FA) and the Rugby Football Union (known as RFU).
Apart from the origins of the sports, they share few relations, the most prominent being the pitch.. The Pitch for soccer, American Football and Rugby are the same size.
Please see the Related questions below for "What rhymes with soccer?" and "What rhymes with football?"
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fOOTBALL Soccer FOOTBALL soccer Football soccer all around the world
The American had a form of football already so they decide to somehow related AsSOCiation to soccer. they took the letters SOC and called it Soccer.
Americans call soccer soccer, and football football!
soccer is American for football
football which they call soccer! football to them is soccer!
soccer = football "a game of soccer" = "a football match"
Technically speaking, football is soccer. In Austalia they have a sport called football, and that's why the original football is called soccer (confusing lol). But in most countries, soccer is football.
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Unlike Rugby Soccer (football) has only a few hand signals. For a visual reference see related link
# football,ice hockey,roller hockey, and i think soccer.