unify vs espouse

unify and espouse both are verbs.

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

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

unify (verb)	espouse (verb)
become one	take up the cause, ideology, practice, method, of someone and use it as one's own
join or combine	choose and follow; as of theories, ideas, policies, strategies or plans
to bring or combine together or with something else	take in marriage; married
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