vertebral column vs rachis

vertebral column and rachis both are nouns.

Word	Noun	Adjective	Verb	Adverb
vertebral column	Yes	No	No	No
rachis	Yes	No	No	No

As nouns, vertebral column and rachis are synonyms defined as:

vertebral column and rachis: the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

Other synonyms of vertebral column include back, backbone, spinal column, spine.

vertebral column (noun)	rachis (noun)
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord	the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
	axis of a compound leaf or compound inflorescence