rectal vein vs vena rectalis

rectal vein and vena rectalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
rectal vein	Yes	No	No	No
vena rectalis	Yes	No	No	No

As nouns, rectal vein and vena rectalis are synonyms defined as:

rectal vein and vena rectalis: any of several veins draining the walls of the anal canal and rectum

Other synonyms of rectal vein include hemorrhoidal vein.

rectal vein (noun)	vena rectalis (noun)
any of several veins draining the walls of the anal canal and rectum	any of several veins draining the walls of the anal canal and rectum