vena rectalis vs hemorrhoidal vein

vena rectalis and hemorrhoidal vein both are nouns.

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

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

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

Other synonyms of vena rectalis include rectal vein.

vena rectalis (noun)	hemorrhoidal vein (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