vena comitans vs accompanying vein

vena comitans and accompanying vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena comitans	Yes	No	No	No
accompanying vein	Yes	No	No	No

As nouns, vena comitans and accompanying vein are synonyms defined as:

vena comitans and accompanying vein: a vein accompanying another structure; a vein may accompany an artery in such a way that the arterial pulses aid venous return

vena comitans (noun)	accompanying vein (noun)
a vein accompanying another structure; a vein may accompany an artery in such a way that the arterial pulses aid venous return	a vein accompanying another structure; a vein may accompany an artery in such a way that the arterial pulses aid venous return