spine vs axial skeleton

spine and axial skeleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
spine	Yes	No	No	No
axial skeleton	Yes	No	No	No

spine (noun)	axial skeleton (noun)
a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin	the part of the skeleton that includes the skull and spinal column and sternum and ribs
the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
a small sharp-pointed tip resembling a spike on a stem or leaf
any sharply pointed projection