spouse equivalent vs domestic partner

spouse equivalent and domestic partner both are nouns.

Word	Noun	Adjective	Verb	Adverb
spouse equivalent	Yes	No	No	No
domestic partner	Yes	No	No	No

As nouns, spouse equivalent and domestic partner are synonyms defined as:

spouse equivalent and domestic partner: a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship

Other synonyms of spouse equivalent include significant other, spousal equivalent.

spouse equivalent (noun)	domestic partner (noun)
a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship	a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship