deep cervical vein vs cervical vein

deep cervical vein and cervical vein both are nouns.

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

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

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

Other synonyms of deep cervical vein include vena cervicalis profunda.

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