oblique vein of the left atrium vs vena obliqua atrii sinistri

oblique vein of the left atrium and vena obliqua atrii sinistri both are nouns.

Word	Noun	Adjective	Verb	Adverb
oblique vein of the left atrium	Yes	No	No	No
vena obliqua atrii sinistri	Yes	No	No	No

As nouns, oblique vein of the left atrium and vena obliqua atrii sinistri are synonyms defined as:

oblique vein of the left atrium and vena obliqua atrii sinistri: a tributary of the coronary sinus; on the posterior wall of the left atrium

oblique vein of the left atrium (noun)	vena obliqua atrii sinistri (noun)
a tributary of the coronary sinus; on the posterior wall of the left atrium	a tributary of the coronary sinus; on the posterior wall of the left atrium