abundance vs richness

abundance and richness both are nouns.

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

As nouns, richness is a hyponym of abundance; that is, richness is a word with a more specific, narrower meaning than abundance:

abundance (noun)	richness (noun)
the property of a more than adequate quantity or supply	a strong deep vividness of hue
(chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million	the property of a sensation that is rich and pleasing
(physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present	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