spousal equivalent vs domestic partner

spousal equivalent and domestic partner both are nouns.

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

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

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

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

spousal 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