Dysthymic depression and Depressive disorder

Dysthymic depression noun - Mild chronic depression.

Depressive disorder and dysthymic depression are semantically related. In some cases you can use "Depressive disorder" instead a noun phrase "Dysthymic depression".

Depressive disorder noun - A state of depression and anhedonia so severe as to require clinical intervention.

Dysthymic depression and depressive disorder are semantically related. Sometimes you can replace phrase "Dysthymic depression" with "Depressive disorder", this phrases are similar.