Anxiety disorder and Mental disturbance

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

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

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

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