Unite
Part of speech: verb
Definition: To come or bring together as one.
Example sentence: In Christ was united the human and the divine. His mission was to reconcile God to man, and man to God; to unite the finite with the infinite.
Merge
Part of speech: verb
Definition: To combine into a whole.To combine into a whole.To blend gradually into something else.
Part of speech: noun
Definition: A joining together of two flows.
Example sentence: I do love science fiction, but it's not really a genre unto itself; it always seems to merge with another genre. With the few movies I've done, I've ended up playing with genre in some way or another, so any genre that's made to mix with others is like candy to me. It allows you to use big, mythic situations to talk about ordinary things.