amalgamate vs combine

amalgamate is not a noun while combine is a noun.

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

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

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

amalgamate (noun)	combine (noun)
	harvester that heads and threshes and cleans grain while moving across the field
	an occurrence that results in things being united
	a consortium of independent organizations formed to limit competition by controlling the production and distribution of a product or service

amalgamate (adjective)	combine (adjective)
joined together into a whole

amalgamate (verb)	combine (verb)
to bring or combine together or with something else	mix together different elements
	put or add together
	combine so as to form a whole; mix
	gather in a mass, sum, or whole
	add together from different sources
	join for a common purpose or in a common action
	have or possess in combination