psychopathology vs defence mechanism

psychopathology and defence mechanism both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychopathology	Yes	No	No	No
defence mechanism	Yes	No	No	No

psychopathology (noun)	defence mechanism (noun)
the branch of medicine dealing with the diagnosis and treatment of mental disorders	(psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
the branch of psychology concerned with abnormal behavior