matriarchy vs social structure

matriarchy and social structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
matriarchy	Yes	No	No	No
social structure	Yes	No	No	No

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

matriarchy: a form of social organization in which a female is the family head and title is traced through the female line
social structure: the people in a society considered as a system organized by a characteristic pattern of relationships

Other hypernyms of matriarchy include social organisation, social organization, social system, structure.

matriarchy (noun)	social structure (noun)
a form of social organization in which a female is the family head and title is traced through the female line	the people in a society considered as a system organized by a characteristic pattern of relationships