What is the masculine form of goddess?

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

The noun for a female deity is goddess.

The noun for a male deity is god.

The noun 'god' is a common noun as a general term for any deity or any person or thing to which excessive attention is given.

The noun 'God' as a proper noun is a Word for a specific deity.