espousal vs espouse

espousal is a noun but espouse is not a noun.

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

espousal (noun)	espouse (noun)
the act of accepting with approval; favorable reception
archaic terms for a wedding or wedding feast
the act of becoming betrothed or engaged

espousal (verb)	espouse (verb)
	take up the cause, ideology, practice, method, of someone and use it as one's own
	choose and follow; as of theories, ideas, policies, strategies or plans
	take in marriage; married