vena pectoralis vs pectoral vein

vena pectoralis and pectoral vein both are nouns.

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

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

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

vena pectoralis (noun)	pectoral vein (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