split up vs espouse

split up is a noun but espouse is not a noun.

Word	Noun	Adjective	Verb	Adverb
split up	Yes	No	Yes	No
espouse	No	No	Yes	No

split up (noun)	espouse (noun)
an increase in the number of outstanding shares of a corporation without changing the shareholders' equity

split up (verb)	espouse (verb)
become separated into pieces or fragments	take up the cause, ideology, practice, method, of someone and use it as one's own
get a divorce; formally terminate a marriage	choose and follow; as of theories, ideas, policies, strategies or plans
discontinue an association or relation; go different ways	take in marriage; married
separate into parts or portions