plenty vs heap

plenty and heap both are nouns.

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

As nouns, plenty and heap are synonyms defined as:

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

plenty (noun)	heap (noun)
a full supply	a car that is old and unreliable
(often followed by `of') a large number or amount or extent	a collection of objects laid on top of each other
	(often followed by `of') a large number or amount or extent

plenty (adverb)	heap (adverb)
as much as necessary