social organization vs social structure

social organization and social structure both are nouns.

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

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

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

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

social organization (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