social system vs social organisation

social system and social organisation both are nouns.

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

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

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

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

social system (noun)	social organisation (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