secularism vs school of thought

secularism and school of thought both are nouns.

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

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

secularism: a doctrine that rejects religion and religious considerations
school of thought: a belief (or system of beliefs) accepted as authoritative by some group or school

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

secularism (noun)	school of thought (noun)
a doctrine that rejects religion and religious considerations	a belief (or system of beliefs) accepted as authoritative by some group or school