Cleithrophobia is the fear of being trapped in a confined space or a closed-in area. This fear is real and can be debilitating for some people. There are several synonyms for the word cleithrophobia, including agoraphobia, claustrophobia, entomophobia, and nyctophobia. Agoraphobia is the fear of open spaces, while claustrophobia is the fear of confined spaces. Entomophobia is the fear of insects, which can also cause a sense of being trapped, and nyctophobia is the fear of the dark. Each of these phobias can induce feelings of confinement, fear, and anxiety. If you experience any of these phobias, you should seek treatment from a trained mental health professional.