musculophrenic vein vs vena

musculophrenic vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
musculophrenic vein	Yes	No	No	No
vena	Yes	No	No	No

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

musculophrenic vein: veins that drain the upper abdominal wall and the lower intercostal spaces and the abdomen
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of musculophrenic vein include vein, venous blood vessel.

musculophrenic vein (noun)	vena (noun)
veins that drain the upper abdominal wall and the lower intercostal spaces and the abdomen	a blood vessel that carries blood from the capillaries toward the heart