cervical vein vs deep cervical vein

cervical vein and deep cervical vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
cervical vein	Yes	No	No	No
deep cervical vein	Yes	No	No	No

As nouns, cervical vein and deep cervical vein are synonyms defined as:

cervical vein and deep cervical vein: a vein that accompanies an artery of the same name

Other synonyms of cervical vein include vena cervicalis profunda.

cervical vein (noun)	deep cervical vein (noun)
a vein that accompanies an artery of the same name	a vein that accompanies an artery of the same name