What is the masculine or feminine of patroness?

In English there are no masculine or feminine forms. English uses gender specific nouns for male or female.

The noun 'patroness' is a Word for a female who supports the work of writers, artists, or musicians, most often by giving them money.

The corresponding noun 'patron' is a common gender noun, a Word for a person (male or female) who supports the work of writers, artists, or musicians.

The noun 'patron' is also a common gender noun as a Word for a regular customer of a business establishment.