amalgamation vs merger

amalgamation and merger both are nouns.

Word	Noun	Adjective	Verb	Adverb
amalgamation	Yes	No	No	No
merger	Yes	No	No	No

As nouns, amalgamation and merger are synonyms defined as:

amalgamation and merger: the combination of two or more commercial companies

Other synonyms of amalgamation include uniting.

amalgamation (noun)	merger (noun)
the combination of two or more commercial companies	the combination of two or more commercial companies
	an occurrence that involves the production of a union