family vs social unit

family and social unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
family	Yes	No	No	No
social unit	Yes	No	No	No

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

Other hypernyms of family include unit.

family (noun)	social unit (noun)
primary social group; parents and children	an organization regarded as part of a larger social group
people descended from a common ancestor
a social unit living together
(biology) a taxonomic group containing one or more genera
a collection of things sharing a common attribute
an association of people who share common beliefs or activities
a loose affiliation of gangsters in charge of organized criminal activities
a person having kinship with another or others