tracheal vein vs vena

tracheal vein and vena both are nouns.

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

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

tracheal vein: several small veins from the trachea
vena: a blood vessel that carries blood from the capillaries toward the heart

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

tracheal vein (noun)	vena (noun)
several small veins from the trachea	a blood vessel that carries blood from the capillaries toward the heart