plenty vs plentifulness

plenty and plentifulness both are nouns.

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

As nouns, plenty and plentifulness are synonyms defined as:

Other synonyms of plenty include plenitude, plenteousness, plentitude.

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

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