psychopathology vs psychological medicine

psychopathology and psychological medicine both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychopathology	Yes	No	No	No
psychological medicine	Yes	No	No	No

As nouns, psychopathology and psychological medicine are synonyms defined as:

psychopathology and psychological medicine: the branch of medicine dealing with the diagnosis and treatment of mental disorders

Other synonyms of psychopathology include psychiatry.

psychopathology (noun)	psychological medicine (noun)
the branch of medicine dealing with the diagnosis and treatment of mental disorders	the branch of medicine dealing with the diagnosis and treatment of mental disorders
the branch of psychology concerned with abnormal behavior