gymnosophy vs school of thought

gymnosophy and school of thought both are nouns.

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

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

gymnosophy: the doctrine of a sect of Hindu philosophers who practiced nudity and asceticism and meditation
school of thought: a belief (or system of beliefs) accepted as authoritative by some group or school

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

gymnosophy (noun)	school of thought (noun)
the doctrine of a sect of Hindu philosophers who practiced nudity and asceticism and meditation	a belief (or system of beliefs) accepted as authoritative by some group or school