amalgamate vs concoct

amalgamate is an adjective but concoct is not an adjective.

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

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

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

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

amalgamate (verb)	concoct (verb)
to bring or combine together or with something else	make a concoction (of) by mixing
	devise or invent
	prepare or cook by mixing ingredients
	invent