sum vs aggregation

sum and aggregation both are nouns.

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

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

Other hypernyms of sum include accumulation, assemblage, collection.

sum (noun)	aggregation (noun)
the whole amount	the act of gathering something together
the choicest or most essential or most vital part of some idea or experience	several things grouped together or considered as a whole
a quantity obtained by the addition of a group of numbers
the final aggregate
a set containing all and only the members of two or more given sets
a quantity of money

sum (verb)	aggregation (verb)
determine the sum of
be a summary of