reunification vs reunion

reunification and reunion both are nouns.

Word	Noun	Adjective	Verb	Adverb
reunification	Yes	No	No	No
reunion	Yes	No	No	No

As nouns, reunification and reunion are synonyms defined as:

reunification (noun)	reunion (noun)
the act of coming together again	the act of coming together again
	a party of former associates who have come together again