unification vs union

unification and union both are nouns.

Word	Noun	Adjective	Verb	Adverb
unification	Yes	No	No	No
union	Yes	Yes	No	No

As nouns, unification and union are synonyms defined as:

Other synonyms of unification include conjugation, jointure, uniting.

As nouns, union is a hypernym of unification; that is, union is a word with a broader meaning than unification:

As nouns, unification and union are synonyms defined as:

unification (noun)	union (noun)
the act of making or becoming a single unit	the act of making or becoming a single unit
an occurrence that involves the production of a union	the act of pairing a male and female for reproductive purposes
the state of being joined or united or linked	a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner)
	the occurrence of a uniting of separate parts
	an organization of employees formed to bargain with the employer
	a political unit formed from previously independent people or organizations
	a set containing all and only the members of two or more given sets
	healing process involving the growing together of the edges of a wound or the growing together of broken bones
	the state of being joined or united or linked
	the state of being a married couple voluntarily joined for life (or until divorce)

unification (adjective)	union (adjective)
	of trade unions