Anxiety reaction and Anxiety disorder

Anxiety reaction noun - An anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension or sweating or trembling or lightheadedness or irritability etc that has lasted for more than six months.

Anxiety disorder and anxiety reaction are semantically related. In some cases you can use "Anxiety disorder" instead a noun phrase "Anxiety reaction".

Anxiety disorder noun - A cover term for a variety of mental disorders in which severe anxiety is a salient symptom.

Anxiety reaction and anxiety disorder are semantically related. Sometimes you can replace phrase "Anxiety reaction" with "Anxiety disorder", this phrases are similar.