oratorio vs classical music

oratorio and classical music both are nouns.

Word	Noun	Adjective	Verb	Adverb
oratorio	Yes	No	No	No
classical music	Yes	No	No	No

As nouns, classical music is a hypernym of oratorio; that is, classical music is a word with a broader meaning than oratorio:

oratorio: a musical composition for voices and orchestra based on a religious text
classical music: traditional genre of music conforming to an established form and appealing to critical interest and developed musical taste

Other hypernyms of oratorio include classical, serious music.

oratorio (noun)	classical music (noun)
a musical composition for voices and orchestra based on a religious text	traditional genre of music conforming to an established form and appealing to critical interest and developed musical taste