splendour vs grandeur

splendour and grandeur both are nouns.

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

As nouns, splendour and grandeur are synonyms defined as:

splendour and grandeur: the quality of being magnificent or splendid or grand

Other synonyms of splendour include brilliance, grandness, magnificence, splendor.

splendour (noun)	grandeur (noun)
a quality that outshines the usual	the quality of being magnificent or splendid or grand
the quality of being magnificent or splendid or grand	the quality of elevation of mind and exaltation of character or ideals or conduct