According to Psychology Today, the most common fears are: Flying, Public Speaking, Heights, Darkness, Intimacy, Death, Failure, Rejection, Spiders, and Commitment. I would add fear of: Falling, Sickness, Germs, Harmed, Success, and Crowds.
There are levels of fear (Trepidation, Nervousness, Anxiety, Dread, Desperation, Panic, Horror, Terror).