Fútbol vs. balompié
The words fútbol and balompié are both used in Spanish to refer to the sport known as football or soccer. Generally, their meanings are interchangeable, but there are subtle differences based on regions, preference, and historical use.
Fútbol
A1This is the most widespread term used to refer to the game of football (or soccer) in Spanish-speaking countries. The word is a direct adaptation of the English word football.
Me gusta jugar al fútbol los fines de semana.
(I like playing football on weekends.)
Balompié
B2This word also refers to the game of football or soccer, but it's less commonly used. It's more of an old-fashioned term, and it originates from combining the words for ball (balón) and foot (pie). Some people prefer this term as a more Spanish alternative to the anglicized fútbol.
El balompié es un deporte que requiere gran habilidad y resistencia.
(Soccer is a sport that requires great skill and endurance.)
Summary
Fútbol and balompié both refer to the sport known internationally as football or soccer. While they mean essentially the same thing, usage may depend on context and nuance. Fútbol is more universally understood and used, while balompié has a more Spanish flavor but might not be recognized by all Spanish speakers.