uniting vs amalgamation

uniting and amalgamation both are nouns.

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

As nouns, uniting and amalgamation are synonyms defined as:

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

Other synonyms of uniting include merger.

uniting (noun)	amalgamation (noun)
the act of making or becoming a single unit	the combination of two or more commercial companies
the combination of two or more commercial companies