richness vs profusion

richness and profusion both are nouns.

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

As nouns, richness and profusion are synonyms defined as:

Other synonyms of richness include cornucopia, profuseness.

richness (noun)	profusion (noun)
a strong deep vividness of hue	the property of being extremely abundant
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