domestic partner vs spousal equivalent

domestic partner and spousal equivalent both are nouns.

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

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

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

Other synonyms of domestic partner include significant other, spouse equivalent.

domestic partner (noun)	spousal equivalent (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