pluralism vs school of thought

pluralism and school of thought both are nouns.

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

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

pluralism: the doctrine that reality consists of several basic substances or elements
school of thought: a belief (or system of beliefs) accepted as authoritative by some group or school

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

pluralism (noun)	school of thought (noun)
the practice of one person holding more than one benefice at a time	a belief (or system of beliefs) accepted as authoritative by some group or school
the doctrine that reality consists of several basic substances or elements
a social organization in which diversity of racial or religious or ethnic or cultural groups is tolerated