sublimity vs grandeur

sublimity and grandeur both are nouns.

Word	Noun	Adjective	Verb	Adverb
sublimity	Yes	No	No	No
grandeur	Yes	No	No	No

As nouns, grandeur is a hypernym of sublimity; that is, grandeur is a word with a broader meaning than sublimity:

sublimity: nobility in thought or feeling or style
grandeur: the quality of elevation of mind and exaltation of character or ideals or conduct

Other hypernyms of sublimity include magnanimousness, nobility, nobleness.

sublimity (noun)	grandeur (noun)
nobility in thought or feeling or style	the quality of being magnificent or splendid or grand
	the quality of elevation of mind and exaltation of character or ideals or conduct