thoracoepigastric vein vs vena

thoracoepigastric vein and vena both are nouns.

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

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

thoracoepigastric vein: a vein arising from the region of the superficial epigastric vein and opening into the axillary vein or thoracic vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

thoracoepigastric vein (noun)	vena (noun)
a vein arising from the region of the superficial epigastric vein and opening into the axillary vein or thoracic vein	a blood vessel that carries blood from the capillaries toward the heart