'Monster' in the Bible

Am I a sea, or a sea monster, that you put a guard over me?

Awake, awake, put on strength, arm of Yahweh; awake, as in the days of old, the generations of ancient times. Isn't it you who cut Rahab in pieces, who pierced the monster?

Nebuchadnezzar the king of Babylon has devoured me, he has crushed me, he has made me an empty vessel, he has, like a monster, swallowed me up, he has filled his maw with my delicacies; he has cast me out.

Speak and say, 'Thus says the Lord Yahweh: "Behold, I am against you, Pharaoh king of Egypt, the great monster that lies in the midst of his rivers, that has said, 'My river is my own, and I have made it for myself.'

Son of man, take up a lamentation over Pharaoh king of Egypt, and tell him, You were likened to a young lion of the nations: yet you are as a monster in the seas; and you did break forth with your rivers, and troubled the waters with your feet, and fouled their rivers.