vertebral column vs axial skeleton

vertebral column and axial skeleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
vertebral column	Yes	No	No	No
axial skeleton	Yes	No	No	No

vertebral column (noun)	axial skeleton (noun)
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord	the part of the skeleton that includes the skull and spinal column and sternum and ribs