defense mechanism vs defense reaction

defense mechanism and defense reaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
defense mechanism	Yes	No	No	No
defense reaction	Yes	No	No	No

As nouns, defense mechanism and defense reaction are synonyms defined as:

defense mechanism and defense reaction: (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires

Other synonyms of defense mechanism include defence, defence mechanism, defence reaction, defense.

defense mechanism (noun)	defense reaction (noun)
(psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires	(psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires