neck bone vs cervical vertebra

neck bone and cervical vertebra both are nouns.

Word	Noun	Adjective	Verb	Adverb
neck bone	Yes	No	No	No
cervical vertebra	Yes	No	No	No

As nouns, neck bone and cervical vertebra are synonyms defined as:

neck bone and cervical vertebra: one of 7 vertebrae in the human spine located in the neck region

neck bone (noun)	cervical vertebra (noun)
one of 7 vertebrae in the human spine located in the neck region	one of 7 vertebrae in the human spine located in the neck region