richness vs impressiveness

richness and impressiveness both are nouns.

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

As nouns, richness and impressiveness are synonyms defined as:

Other synonyms of richness include grandness, magnificence.

richness (noun)	impressiveness (noun)
a strong deep vividness of hue	splendid or imposing in size or appearance
the property of a sensation that is rich and pleasing	the quality of making a strong or vivid impression on the mind
the property of producing abundantly and sustaining vigorous and luxuriant growth
the property of being extremely abundant
splendid or imposing in size or appearance
the quality of having high intrinsic value
abundant wealth