posterior vein of the left ventricle vs vena posterior ventriculi sinistri

posterior vein of the left ventricle and vena posterior ventriculi sinistri both are nouns.

Word	Noun	Adjective	Verb	Adverb
posterior vein of the left ventricle	Yes	No	No	No
vena posterior ventriculi sinistri	Yes	No	No	No

As nouns, posterior vein of the left ventricle and vena posterior ventriculi sinistri are synonyms defined as:

posterior vein of the left ventricle and vena posterior ventriculi sinistri: arises near the apex of the heart and empties into the coronary sinus

posterior vein of the left ventricle (noun)	vena posterior ventriculi sinistri (noun)
arises near the apex of the heart and empties into the coronary sinus	arises near the apex of the heart and empties into the coronary sinus