sum total vs aggregation

sum total and aggregation both are nouns.

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

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

Other hypernyms of sum total include accumulation, assemblage, collection.

sum total (noun)	aggregation (noun)
the final aggregate	the act of gathering something together
	several things grouped together or considered as a whole