Class structure and Digging up

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

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

Digging up noun - The act of digging something out of the ground (especially a corpse) where it has been buried.

Class structure and digging up are semantically related. Sometimes you can use "Class structure" instead a noun "Digging up".