Select the most appropriate 'one word' for the expression given below. Fear of heights.

Agoraphobia Claustrophobia Acrophobia Homophobia

Acrophobia

The most appropriate one-word substitution for the expression "fear of heights" is acrophobia. Agoraphobia is a fear of open spaces. Claustrophobia is a fear of enclosed spaces. Homophobia is a fear or dislike of homosexual people.