This is the 362nd most frequent Spanish word.
compra
"Compra" means "purchase" or "buying" in English.
In this sentence, 'compra' is used as a noun to refer to the act of purchasing an item.
Ella realizó la compra de su libro favorito en la librería.
She made the purchase of her favorite book at the bookstore.
Here, 'compra' is the conjugated verb form in present tense, meaning 'he buys'.
Él compra frutas frescas en el mercado los sábados.
He buys fresh fruits at the market on Saturdays.
In this context, 'compra' is a noun referring to the act of making a purchase.