social system vs social structure

social system and social structure both are nouns.

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

As nouns, social system and social structure are synonyms defined as:

social system and social structure: the people in a society considered as a system organized by a characteristic pattern of relationships

Other synonyms of social system include social organisation, social organization, structure.

social system (noun)	social structure (noun)
the people in a society considered as a system organized by a characteristic pattern of relationships	the people in a society considered as a system organized by a characteristic pattern of relationships