congregation vs aggregation

congregation and aggregation both are nouns.

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

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

congregation: an assemblage of people or animals or things collected together
aggregation: several things grouped together or considered as a whole

Other hypernyms of congregation include accumulation, assemblage, collection.

congregation (noun)	aggregation (noun)
the act of congregating	the act of gathering something together
a group of people who adhere to a common faith and habitually attend a given church	several things grouped together or considered as a whole
an assemblage of people or animals or things collected together