coronary sinus vs sinus coronarius

coronary sinus and sinus coronarius both are nouns.

Word	Noun	Adjective	Verb	Adverb
coronary sinus	Yes	No	No	No
sinus coronarius	Yes	No	No	No

As nouns, coronary sinus and sinus coronarius are synonyms defined as:

coronary sinus and sinus coronarius: a short sinus receiving most of the veins of the heart; empties into the right atrium

coronary sinus (noun)	sinus coronarius (noun)
a short sinus receiving most of the veins of the heart; empties into the right atrium	a short sinus receiving most of the veins of the heart; empties into the right atrium