Dissociative disorder and Mental disturbance

Dissociative disorder noun - Dissociation so severe that the usually integrated functions of consciousness and perception of self break down.

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

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

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