Depressive disorder and Reactive depression

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

Reactive depression and depressive disorder are semantically related. In some cases you can replace phrase "Reactive depression" with "Depressive disorder", this phrases are similar.

Reactive depression noun - An inappropriate state of depression that is precipitated by events in the person's life (to be distinguished from normal grief).

Depressive disorder and reactive depression are semantically related. You can use "Depressive disorder" instead a noun phrase "Reactive depression".