lover vs spouse equivalent

lover and spouse equivalent both are nouns.

Word	Noun	Adjective	Verb	Adverb
lover	Yes	No	No	No
spouse equivalent	Yes	No	No	No

As nouns, spouse equivalent is a hypernym of lover; that is, spouse equivalent is a word with a broader meaning than lover:

lover: a significant other to whom you are not related by marriage
spouse equivalent: a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship

Other hypernyms of lover include domestic partner, significant other, spousal equivalent.

lover (noun)	spouse equivalent (noun)
a person who loves someone or is loved by someone	a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship
an ardent follower and admirer
a significant other to whom you are not related by marriage