heap vs large indefinite amount

heap and large indefinite amount both are nouns.

Word	Noun	Adjective	Verb	Adverb
heap	Yes	No	Yes	No
large indefinite amount	Yes	No	No	No

As nouns, large indefinite amount is a hypernym of heap; that is, large indefinite amount is a word with a broader meaning than heap:

heap: (often followed by `of') a large number or amount or extent
large indefinite amount: an indefinite quantity that is above the average in size or magnitude

Other hypernyms of heap include large indefinite quantity.

heap (noun)	large indefinite amount (noun)
a car that is old and unreliable	an indefinite quantity that is above the average in size or magnitude
a collection of objects laid on top of each other
(often followed by `of') a large number or amount or extent

heap (verb)	large indefinite amount (verb)
fill to overflow
arrange in stacks
bestow in large quantities