abundance vs copiousness

abundance and copiousness both are nouns.

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

As nouns, abundance and copiousness are synonyms defined as:

abundance and copiousness: the property of a more than adequate quantity or supply

Other synonyms of abundance include teemingness.

abundance (noun)	copiousness (noun)
the property of a more than adequate quantity or supply	the property of a more than adequate quantity or supply
(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