hemorrhoidal vein vs vena rectalis

hemorrhoidal vein and vena rectalis both are nouns.

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

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

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

Other synonyms of hemorrhoidal vein include rectal vein.

hemorrhoidal 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