clinical depression vs depressive disorder

clinical depression and depressive disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
clinical depression	Yes	No	No	No
depressive disorder	Yes	No	No	No

As nouns, clinical depression and depressive disorder are synonyms defined as:

clinical depression and depressive disorder: a state of depression and anhedonia so severe as to require clinical intervention

Other synonyms of clinical depression include depression.

clinical depression (noun)	depressive disorder (noun)
a state of depression and anhedonia so severe as to require clinical intervention	a state of depression and anhedonia so severe as to require clinical intervention