heap vs good deal

heap and good deal both are nouns.

Word	Noun	Adjective	Verb	Adverb
heap	Yes	No	Yes	No
good deal	Yes	No	No	No

As nouns, heap and good deal are synonyms defined as:

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

heap (noun)	good deal (noun)
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