abundance vs profusion

abundance and profusion both are nouns.

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

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

abundance (noun)	profusion (noun)
the property of a more than adequate quantity or supply	the property of being extremely abundant
(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
(physics) the ratio of the number of atoms of a specific isotope of an element to the total number of isotopes present