lingual vein vs vena

lingual vein and vena both are nouns.

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

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

lingual vein: a vein that receives blood from the tongue and the floor of the mouth and empties into the internal jugular or the facial vein
vena: a blood vessel that carries blood from the capillaries toward the heart

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

lingual vein (noun)	vena (noun)
a vein that receives blood from the tongue and the floor of the mouth and empties into the internal jugular or the facial vein	a blood vessel that carries blood from the capillaries toward the heart