pectoral vein vs vena pectoralis

pectoral vein and vena pectoralis both are nouns.

Word	Noun	Adjective	Verb	Adverb
pectoral vein	Yes	No	No	No
vena pectoralis	Yes	No	No	No

As nouns, pectoral vein and vena pectoralis are synonyms defined as:

pectoral vein and vena pectoralis: veins that drain the pectoral muscles and empty into the subclavian vein

pectoral vein (noun)	vena pectoralis (noun)
veins that drain the pectoral muscles and empty into the subclavian vein	veins that drain the pectoral muscles and empty into the subclavian vein