hatful vs plenty

hatful and plenty both are nouns.

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

As nouns, hatful and plenty are synonyms defined as:

hatful and plenty: (often followed by `of') a large number or amount or extent

hatful (noun)	plenty (noun)
as many or as much as a hat will hold	a full supply
(often followed by `of') a large number or amount or extent	(often followed by `of') a large number or amount or extent

hatful (adverb)	plenty (adverb)
	as much as necessary