unify vs reunite

unify and reunite both are verbs.

Word	Noun	Adjective	Verb	Adverb
unify	No	No	Yes	No
reunite	No	No	Yes	No

As verbs, reunite is a hyponym of unify; that is, reunite is a word with a more specific, narrower meaning than unify:

unify (verb)	reunite (verb)
become one	have a reunion; unite again
join or combine	unify again, as of a country
to bring or combine together or with something else
act in concert or unite in a common purpose or belief
bring together for a common purpose or action or ideology or in a shared situation