This is the 2451st most frequent Spanish word.
roja
"Roja" means "red" (feminine form).
The word 'roja' is used as an adjective to describe the noun 'manzana' (apple), agreeing in gender and number.
La manzana roja está sobre la mesa.
The red apple is on the table.
Here, 'roja' modifies the noun 'camiseta' (shirt) as an attribute, matching its feminine singular form.
Ella llevaba una camiseta roja en la fiesta.
She was wearing a red shirt at the party.
The word 'rojo' describes the state of the sky, showing its masculine form to correspond with the gender of 'cielo' (sky).