ulnar artery vs arteria

ulnar artery and arteria both are nouns.

Word	Noun	Adjective	Verb	Adverb
ulnar artery	Yes	No	No	No
arteria	Yes	No	No	No

As nouns, arteria is a hypernym of ulnar artery; that is, arteria is a word with a broader meaning than ulnar artery:

ulnar artery: large artery that branches from the brachial artery to supply the muscles of the forearm and wrist and hand
arteria: a blood vessel that carries blood from the heart to the body

Other hypernyms of ulnar artery include arterial blood vessel, artery.

ulnar artery (noun)	arteria (noun)
large artery that branches from the brachial artery to supply the muscles of the forearm and wrist and hand	a blood vessel that carries blood from the heart to the body