genicular vein vs vena

genicular vein and vena both are nouns.

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

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

genicular vein: veins that drain blood from structures around the knee; empty into the popliteal vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

genicular vein (noun)	vena (noun)
veins that drain blood from structures around the knee; empty into the popliteal vein	a blood vessel that carries blood from the capillaries toward the heart