Adding the suffix phobia to a root word creates what type of speech?

Adding the suffix "-phobia" to a root word creates a noun that refers to an irrational fear or intense dislike of something.

For example:

* Arachnophobia is the fear of spiders.

* Claustrophobia is the fear of enclosed spaces.

* Agoraphobia is the fear of open spaces or crowds.

So, the suffix "-phobia" creates a noun that describes a specific type of phobia.