unify vs fall in

unify and fall in both are verbs.

Word	Noun	Adjective	Verb	Adverb
unify	No	No	Yes	No
fall in	No	No	Yes	No

As verbs, fall in is a hypernym of unify; that is, fall in is a word with a broader meaning than unify:

Other hypernyms of unify include get together, join.

unify (verb)	fall in (verb)
become one	break down, literally or metaphorically
join or combine	become part of; become a member of a group or organization
to bring or combine together or with something else	to take one's place in a military formation or line
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