rich vs richness

rich and richness both are nouns.

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

rich (noun)	richness (noun)
people who have possessions and wealth (considered as a group)	a strong deep vividness of hue
	the property of a sensation that is rich and pleasing
	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

rich (adjective)	richness (adjective)
possessing material wealth
having an abundant supply of desirable qualities or substances (especially natural resources)
suggestive of or characterized by great expense
high in mineral content; having a high proportion of fuel to air
causing indignation due to hypocrisy
affording an abundant supply
strong; intense
marked by great fruitfulness
pleasantly full and mellow
marked by richness and fullness of flavor
containing plenty of fat, or eggs, or sugar
of great worth or quality
very productive