repression vs defence reaction

repression and defence reaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
repression	Yes	No	No	No
defence reaction	Yes	No	No	No

As nouns, defence reaction is a hypernym of repression; that is, defence reaction is a word with a broader meaning than repression:

repression: (psychiatry) the classical defense mechanism that protects you from impulses or ideas that would cause anxiety by preventing them from becoming conscious
defence reaction: (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires

Other hypernyms of repression include defence, defence mechanism, defense, defense mechanism, defense reaction.

repression (noun)	defence reaction (noun)
the act of repressing; control by holding down	(psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
(psychiatry) the classical defense mechanism that protects you from impulses or ideas that would cause anxiety by preventing them from becoming conscious
a state of forcible subjugation