social structure vs social organisation

social structure and social organisation both are nouns.

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

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

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

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

social structure (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