'Monster' in the Bible

speak, and say, Thus saith the Lord Jehovah: Behold, I am against thee, Pharaoh king of Egypt, the great monster that lieth in the midst of his rivers, which saith, My river is mine own, and I made it for myself.

Son of man, take up a lamentation for Pharaoh king of Egypt, and say unto him, Thou wast like a young lion among the nations, and thou wast as a monster in the seas; and thou didst break forth in thy rivers, and troubledst the waters with thy feet, and fouledst their rivers.