rationalism vs freethinking

rationalism and freethinking both are nouns.

Word	Noun	Adjective	Verb	Adverb
rationalism	Yes	No	No	No
freethinking	Yes	No	No	No

As nouns, rationalism and freethinking are synonyms defined as:

rationalism and freethinking: the doctrine that reason is the right basis for regulating conduct

rationalism (noun)	freethinking (noun)
the doctrine that reason is the right basis for regulating conduct	the doctrine that reason is the right basis for regulating conduct
(philosophy) the doctrine that knowledge is acquired by reason without resort to experience
the theological doctrine that human reason rather than divine revelation establishes religious truth