psychological medicine vs psychopathology

psychological medicine and psychopathology both are nouns.

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

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

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

Other synonyms of psychological medicine include psychiatry.

psychological medicine (noun)	psychopathology (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