In English there are no masculine or feminine forms. English uses gender specific nouns for male or female.
The noun 'votaress' is a gender specific noun for a female who has made vows of dedication to religious service, or who is a devoted follower of someone or something.
The corresponding gender specific noun for a male is votary.
The feminine form of ami is amie. The feminine plural is amies.
Mistress is the feminine form of master. It is already in feminine form.
The feminine form of a baron is a baroness.
The feminine form of alumnus is alumna. The feminine plural is alumnae.
The feminine form of charmant is charmante. The feminine plural is charmantes.
The feminine form of bajo is baja. The feminine plural is bajas.
The feminine form of benefactor is benefactress.
The feminine form of groom is bride. The female partner in a marriage.
The feminine form of the name Ronald is Ronaldine.
The feminine form of grandfather is grandmother.
The feminine form of Duke is Duchess.
It's feminine. The indefinite article 'une' is the feminine form for 'a, an, one' in French. The feminine form of the definite article 'la' means 'the'.