vena thyroidea vs vena

vena thyroidea and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena thyroidea	Yes	No	No	No
vena	Yes	No	No	No

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

vena thyroidea: any of several small veins draining blood from the thyroid area
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena thyroidea include vein, venous blood vessel.

vena thyroidea (noun)	vena (noun)
any of several small veins draining blood from the thyroid area	a blood vessel that carries blood from the capillaries toward the heart