conversion vs defence reaction

conversion and defence reaction both are nouns.

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

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

conversion: (psychiatry) a defense mechanism represses emotional conflicts which are then converted into physical symptoms that have no organic basis
defence reaction: (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires

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

conversion (noun)	defence reaction (noun)
the act of changing from one use or function or purpose to another	(psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
a spiritual enlightenment causing a person to lead a new life
a successful free throw or try for point after a touchdown
act of exchanging one type of money or security for another
a change in the units or form of an expression:
interchange of subject and predicate of a proposition
an event that results in a transformation
a change of religion
(psychiatry) a defense mechanism represses emotional conflicts which are then converted into physical symptoms that have no organic basis