In England they are the same thing. However an English person would only really refer to it as Football. In America they call American Football (NFL) , football. They refer to football as soccer. To avoid confusion to a worldwide audience you could use Soccer although an English person may correct you and say its called Football :)

U.S: -Football (Hands): sport using prolate spheroid (pointy egg shape) ball and thrown between players to reach opposite teams end zone. -Soccer (Feet, hand only for goalie): sport where players must kick spherical ball towards the other teams goal Most of the world: -Soccer is known as Futbol/football/futball, or any variation of spelling depending on the country