unification vs uniting

unification and uniting both are nouns.

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

As nouns, unification and uniting are synonyms defined as:

Other synonyms of unification include conjugation, jointure, union.

unification (noun)	uniting (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 combination of two or more commercial companies
the state of being joined or united or linked