Spinal column and Skeletal structure

Spinal column noun - The series of vertebrae forming the axis of the skeleton and protecting the spinal cord.

Skeletal structure and spinal column are semantically related. In some cases you can use "Skeletal structure" instead a noun phrase "Spinal column".

Skeletal structure noun - Any structure created by the skeleton of an organism.

Spinal column and skeletal structure are semantically related. Sometimes you can replace phrase "Spinal column" with "Skeletal structure", this phrases are similar.