ism vs school of thought

ism and school of thought both are nouns.

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

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

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

Other synonyms of ism include doctrine, philosophical system, philosophy.

ism (noun)	school of thought (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