vena iliolumbalis vs vena

vena iliolumbalis and vena both are nouns.

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

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

vena iliolumbalis: a branch of the internal iliac vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena iliolumbalis (noun)	vena (noun)
a branch of the internal iliac vein	a blood vessel that carries blood from the capillaries toward the heart