unification vs fusion

unification and fusion both are nouns.

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

As nouns, unification and fusion are synonyms defined as:

unification and fusion: an occurrence that involves the production of a union

Other synonyms of unification include merger.

As nouns, fusion is a hyponym of unification; that is, fusion is a word with a more specific, narrower meaning than unification:

unification (noun)	fusion (noun)
the act of making or becoming a single unit	the act of fusing (or melting) together
an occurrence that involves the production of a union	correction of an unstable part of the spine by joining two or more vertebrae; usually done surgically but sometimes done by traction or immobilization
the state of being joined or united or linked	the combining of images from the two eyes to form a single visual percept
	an occurrence that involves the production of a union
	a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
	the merging of adjacent sounds or syllables or words
	the state of being combined into one body