plenitude vs abundance

plenitude and abundance both are nouns.

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

As nouns, abundance is a hypernym of plenitude; that is, abundance is a word with a broader meaning than plenitude:

Other hypernyms of plenitude include copiousness, teemingness.

plenitude (noun)	abundance (noun)
a full 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