axial skeleton vs vertebral column

axial skeleton and vertebral column both are nouns.

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

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