As adverbs the difference between next and finally
is that
next is in a time, place or sequence closest or following while
finally is at the end or conclusion; ultimately.
As an adjective next
is following in a sequence.
As a determiner next
is the one immediately following the current or most recent one.
As a preposition next
is on the side of; next to.
As a noun next
is the one that follows after this one.