As nouns the difference between rationalism and extremism
is that rationalism is the theory that the basis of knowledge is reason, rather than experience or divine revelation while extremism is extreme ideas or actions.
rationalism
Noun
(philosophy) The theory that the basis of knowledge is reason, rather than experience or divine revelation.
Synonyms
* intellectualism
Antonyms
* irrationalism
* traditionalism
Derived terms
* critical rationalism
Related terms
* rationalist
* rationality
See also
* empiricism