Class structure and Social system

Class structure noun - The organization of classes within a society.

Social system and class structure are semantically related. In some cases you can use "Social system" instead a noun phrase "Class structure".

Social system noun - The people in a society considered as a system organized by a characteristic pattern of relationships.

Class structure and social system are semantically related. Sometimes you can replace phrase "Class structure" with "Social system", this phrases are similar.