spine vs intervertebral disk

spine and intervertebral disk both are nouns.

Word	Noun	Adjective	Verb	Adverb
spine	Yes	No	No	No
intervertebral disk	Yes	No	No	No

spine (noun)	intervertebral disk (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	a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two)
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