conjugal family vs household

conjugal family and household both are nouns.

Word	Noun	Adjective	Verb	Adverb
conjugal family	Yes	No	No	No
household	Yes	No	No	No

As nouns, household is a hypernym of conjugal family; that is, household is a word with a broader meaning than conjugal family:

conjugal family: a family consisting of parents and their children and grandparents of a marital partner
household: a social unit living together

Other hypernyms of conjugal family include family, home, house, menage.

conjugal family (noun)	household (noun)
a family consisting of parents and their children and grandparents of a marital partner	a social unit living together