amalgamate vs aggregate

amalgamate is not a noun while aggregate is a noun.

Word	Noun	Adjective	Verb	Adverb
amalgamate	No	Yes	Yes	No
aggregate	Yes	Yes	Yes	No

As verbs, aggregate is a hyponym of amalgamate; that is, aggregate is a word with a more specific, narrower meaning than amalgamate:

Other hyponyms of amalgamate include combine, concoct, combine, compound, blend, immingle, intermingle, intermix.

amalgamate (noun)	aggregate (noun)
	the whole amount
	a sum total of many heterogenous things taken together
	material such as sand or gravel used with cement and water to make concrete, mortar, or plaster

amalgamate (adjective)	aggregate (adjective)
joined together into a whole	composed of a dense cluster of separate units such as carpels or florets or drupelets
	formed of separate units gathered into a mass or whole

amalgamate (verb)	aggregate (verb)
to bring or combine together or with something else	gather in a mass, sum, or whole
	amount in the aggregate to