venae esophageae vs esophageal veins

venae esophageae and esophageal veins both are nouns.

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

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

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

Other synonyms of venae esophageae include oesophageal veins.

venae esophageae (noun)	esophageal veins (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