heap vs aggregation

heap and aggregation both are nouns.

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

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

Other hypernyms of heap include accumulation, assemblage, collection.

heap (noun)	aggregation (noun)
a car that is old and unreliable	the act of gathering something together
a collection of objects laid on top of each other	several things grouped together or considered as a whole
(often followed by `of') a large number or amount or extent