richness vs grandness

richness and grandness both are nouns.

Word	Noun	Adjective	Verb	Adverb
richness	Yes	No	No	No
grandness	Yes	No	No	No

As nouns, richness and grandness are synonyms defined as:

Other synonyms of richness include impressiveness, magnificence.

richness (noun)	grandness (noun)
a strong deep vividness of hue	the quality of being magnificent or splendid or grand
the property of a sensation that is rich and pleasing	unusual largeness in size or extent or number
the property of producing abundantly and sustaining vigorous and luxuriant growth	splendid or imposing in size or appearance
the property of being extremely abundant	a prominent status
splendid or imposing in size or appearance
the quality of having high intrinsic value
abundant wealth