cervical vertebra vs neck bone

cervical vertebra and neck bone both are nouns.

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

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

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

cervical vertebra (noun)	neck bone (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