vena rectalis vs vena

vena rectalis and vena both are nouns.

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

As nouns, vena is a hypernym of vena rectalis; that is, vena is a word with a broader meaning than vena rectalis:

vena rectalis: any of several veins draining the walls of the anal canal and rectum
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena rectalis include vein, venous blood vessel.

vena rectalis (noun)	vena (noun)
any of several veins draining the walls of the anal canal and rectum	a blood vessel that carries blood from the capillaries toward the heart