freethinking vs doctrine

freethinking and doctrine both are nouns.

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

As nouns, doctrine is a hypernym of freethinking; that is, doctrine is a word with a broader meaning than freethinking:

freethinking: the doctrine that reason is the right basis for regulating conduct
doctrine: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of freethinking include ism, philosophical system, philosophy, school of thought.

freethinking (noun)	doctrine (noun)
the doctrine that reason is the right basis for regulating conduct	a belief (or system of beliefs) accepted as authoritative by some group or school