spinal column vs intervertebral disk

spinal column and intervertebral disk both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinal column	Yes	No	No	No
intervertebral disk	Yes	No	No	No

spinal column (noun)	intervertebral disk (noun)
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord	a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two)