Anxiety disorder and Mental disorder

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

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

Mental disorder noun - (psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness.

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