God: the one true deity, and by extension any being worshiped as a god
This is the singular form behind the far more common plural Elohim, and like that plural it points overwhelmingly to the one true God. It is a poet's word: more than two-thirds of its appearances are in the book of Job, where it serves as the steady, dignified name for the God whom Job and his friends argue about, and the rest cluster in poetry such as the Psalms, Deuteronomy 32, Habakkuk, and Proverbs.
The two senses below are not two different words but one word seen from two angles. Its core is simply deity, a being who is worshiped. Most often the reader already knows that being is Israel's God, so the word means God plainly. But the same word can stand for the bare category of god, which is what makes it the natural choice when a writer wants to deny that the so-called gods of the nations are anything at all, or to expose a conqueror who has made his own strength his god.
Because it carries no built-in marker of which deity is meant, context does all the work. When Job says God, he means the Almighty; when Daniel speaks of a god the fathers did not know, the same word names a counterfeit.