There are many forms of football. The word football is a generic tern used to cover all forms of the sport.
If you play football in:-
Australia, you will be playing Australian Rules football
Americia, GridIron
Ireland, Galic Football
Brittan, Soccer
Usually in any particular Country the other forms of football are refered to by the specif terms of
Australian Rules, Soccer, Rugby League, Rugby Union, GridIron, Galic Football or Soccer.
Extract from dictionary.com
9 results for: football
foot·ball /ˈfʊtˌbɔl/ Pronunciation Key - Show Spelled Pronunciation[foot-bawl] Pronunciation Key - Show IPA Pronunciation
–noun 1. a game in which two opposing teams of 11 players each defend goals at opposite ends of a field having goal posts at each end, with points being scored chiefly by carrying the ball across the opponent's goal line and by place-kicking or drop-kicking the ball over the crossbar between the opponent's goal posts. Compare conversion (def. 13), field goal (def. 1), safety (def. 6), touchdown.
2. the ball used in this game, an inflated oval with a bladder contained in a casing usually made of leather.
3. Chiefly British. Rugby (def. 3).
4. Chiefly British. soccer.