calmer is a verb (to calm, to calm down); it has no masculine nor feminine in French.
The feminine form of "calmer" in French is "calme" for both masculine and feminine subjects.
"Espagne" is feminine in French.
"L'Autriche" is feminine in French.
"Faculté" is feminine in French.
The word "l'oreille" in French is feminine.
"Explication" is a feminine noun in French.
tu dois te calmer / vous devez vous calmer
"Espagne" is feminine in French.
It is feminine.
"L'Autriche" is feminine in French.
"Faculté" is feminine in French.
La photo ("the photo") is feminine in French.
"Explication" is a feminine noun in French.
"Asie" is a feminine noun in French.
The word "l'oreille" in French is feminine.
'une information' is a feminine noun in French.
The word "lentille" is a feminine noun in French.
In French, "rose" is a feminine noun.