plentifulness vs plenty

plentifulness and plenty both are nouns.

Word	Noun	Adjective	Verb	Adverb
plentifulness	Yes	No	No	No
plenty	Yes	No	No	Yes

As nouns, plentifulness and plenty are synonyms defined as:

Other synonyms of plentifulness include plenitude, plenteousness, plentitude.

plentifulness (noun)	plenty (noun)
a full supply	a full supply
	(often followed by `of') a large number or amount or extent

plentifulness (adverb)	plenty (adverb)
	as much as necessary