overgrowth vs richness

overgrowth and richness both are nouns.

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

As nouns, richness is a hypernym of overgrowth; that is, richness is a word with a broader meaning than overgrowth:

Other hypernyms of overgrowth include cornucopia, profuseness, profusion.

overgrowth (noun)	richness (noun)
a profusion of growth on or over something else	a strong deep vividness of hue
excessive size; usually caused by excessive secretion of growth hormone from the pituitary gland	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