A god is a male deity, in contrast with a goddess, a female deity. While the term "goddess" specifically refers to a female deity, the plural "gods" can be applied to deities collectively, regardless of gender. The Greek and Roman pantheons were ruled by Zeus and Jupiter.
When ancient Egyptian religion developed closer to monotheism, it was Amun, a male god, who rose to the most prominent place.
War gods, like the rulers of the pantheon, could often be male, such as Ares/Mars and Toutatis.