This is the 3639th most frequent Spanish word.
muchachos
"Muchachos" means "boys" or "young men," and can also refer to "young people" generally.
Here, 'muchachos' refers to young male individuals, commonly boys, indicating a general group of children or young males playing.
Los muchachos juegan en el parque por las tardes.
The boys play at the park in the afternoons.
In this context, 'muchachos' specifies young males who are students in a class, possibly addressing a group directly.
He entregado los exámenes a los muchachos de la clase.
I have handed out the exams to the boys in the class.
'Muchachos' here is used to denote a group of young male individuals, talking about their activity of organizing the party.