oesophageal veins vs venae esophageae

oesophageal veins and venae esophageae both are nouns.

Word	Noun	Adjective	Verb	Adverb
oesophageal veins	Yes	No	No	No
venae esophageae	Yes	No	No	No

As nouns, oesophageal veins and venae esophageae are synonyms defined as:

oesophageal veins and venae esophageae: small veins from the esophagus emptying into the brachiocephalic vein or the azygos veins

Other synonyms of oesophageal veins include esophageal veins.

oesophageal veins (noun)	venae esophageae (noun)
small veins from the esophagus emptying into the brachiocephalic vein or the azygos veins	small veins from the esophagus emptying into the brachiocephalic vein or the azygos veins