This is the 8398th most frequent Japanese word.
恐怖症
Phobia; an irrational fear of something.
The word '恐怖症' is used in combination with '高所' to specify a phobia of heights, creating '高所恐怖症' which means acrophobia.
彼は高所恐怖症なので、高いところが苦手です。
He has acrophobia, so he dislikes high places.
The word '恐怖症' is combined with '閉所' to denote a phobia of enclosed spaces, forming '閉所恐怖症' which refers to claustrophobia.
彼女は閉所恐怖症があるため、狭い空間にいると不安になります。
She has claustrophobia, so she feels anxious in confined spaces.
Here, '恐怖症' is associated with '犬' to describe a specific phobia of dogs, resulting in '犬恐怖症' meaning dog phobia.