monism vs school of thought

monism and school of thought both are nouns.

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

As nouns, school of thought is a hypernym of monism; that is, school of thought is a word with a broader meaning than monism:

monism: the doctrine that reality consists of a single basic substance or element
school of thought: a belief (or system of beliefs) accepted as authoritative by some group or school

Other hypernyms of monism include doctrine, ism, philosophical system, philosophy.

monism (noun)	school of thought (noun)
the doctrine that reality consists of a single basic substance or element	a belief (or system of beliefs) accepted as authoritative by some group or school