school of thought vs doctrine

school of thought and doctrine both are nouns.

Word	Noun	Adjective	Verb	Adverb
school of thought	Yes	No	No	No
doctrine	Yes	No	No	No

As nouns, school of thought and doctrine are synonyms defined as:

school of thought and doctrine: a belief (or system of beliefs) accepted as authoritative by some group or school

Other synonyms of school of thought include ism, philosophical system, philosophy.

school of thought (noun)	doctrine (noun)
a belief (or system of beliefs) accepted as authoritative by some group or school	a belief (or system of beliefs) accepted as authoritative by some group or school