assembling vs aggregation

assembling and aggregation both are nouns.

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

As nouns, assembling and aggregation are synonyms defined as:

Other synonyms of assembling include collecting, collection.

assembling (noun)	aggregation (noun)
the act of gathering something together	the act of gathering something together
	several things grouped together or considered as a whole