Tannin

Genesis 1:21 puts the great tannin in the column of things created and called good, which reads as deliberate given what the word does everywhere else, and Psalm 148:7 goes a step further and calls the tanninim into the choir of creation praising Yahweh. Ezekiel calls Pharaoh one twice (29:3; 32:2), and in Jeremiah 51:34 Zion says Nebuchadnezzar "swallowed me like the tannin," so the same word serves for sea monster, Egypt, and Babylon depending on the enemy in view. Where Tiamat is destroyed outright in Enuma Elish, Genesis separates and bounds the elements outside order (darkness, the deep) without annihilating them, and Yahweh creates the sea monsters as what they are, not as beings gone wrong. They belong to the plan instead of standing in its way, and that departs from the rest of the ancient Near East, where such creatures sit outside the divine order.