spinal canal vs spinal column

spinal canal and spinal column both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinal canal	Yes	No	No	No
spinal column	Yes	No	No	No

spinal canal (noun)	spinal column (noun)
the canal in successive vertebrae through which the spinal cord passes	the series of vertebrae forming the axis of the skeleton and protecting the spinal cord