vena phrenica vs vena

vena phrenica and vena both are nouns.

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

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

vena phrenica: either of two veins that drain the diaphragm
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena phrenica (noun)	vena (noun)
either of two veins that drain the diaphragm	a blood vessel that carries blood from the capillaries toward the heart