This is the 4811th most frequent French word.
religieuse
A "religieuse" is a nun or a type of French pastry.
In this sentence, 'religieuse' refers to a nun, a woman dedicated to religious life.
La religieuse prie dans l'église chaque matin.
The nun prays in the church every morning.
Here, 'religieuses' refers to a pastry, specifically a type of éclair with stacked choux filled with cream and decorated with icing.
Je préfère les religieuses au chocolat plutôt qu'à la vanille.
I prefer chocolate éclairs over vanilla ones.
In this context, 'religieuse' is used as an adjective meaning 'religious,' describing the type of scene depicted in the painting.