Phobias are irrational fears of specific objects or situations that lead to avoidance behavior.
Topic 8.4: 8.4 Bipolar, Depressive, Anxiety, and Obsessive-Compulsive and Related Disorders
Phobias cheat sheet for homework
An extreme or irrational fear of entering open or crowded places, leaving one's own home, or being in places from which escape is difficult.
An extreme or irrational fear or phobia of heights.
Arachnophobia: Extreme or irrational fear of spiders.