The word A. AGGREGATE is both a noun and a verb.
Aggregate as a noun is defined as a whole formed by combining several elements that are typically disparate.
Aggregate as a verb is defined as the act of forming or grouping into a class or cluster.
Congregate is both a verb (gather into a crowd or mass) and an adjective (communal).
Segregate is a verb defined as the act of setting apart from the rest or from each other.