The Bible mentions a number of supernatural beings, starting with the most commonly known ones - God, angels, spirits, but there are also ones that appear less often, like witches (Witch of Endor), or giants (Nephilim).
Is there a comprehensive list of supernatural beings that appear in the Bible along with descriptions of what they are?
As for defining supernatural, lets assume anything that is not part of the natural world, that is, grounded in reality outside of religion. Humans are natural, animals are natural, people worshipping other gods (like wiccans or baalists) are natural, people performing miracles (like Witch of Endor) are supernatural, just like angels, half angels, spirits, etc. In the end, anything not conforming to natural laws is supernatural.