coronary artery vs artery

coronary artery and artery both are nouns.

Word	Noun	Adjective	Verb	Adverb
coronary artery	Yes	No	No	No
artery	Yes	No	No	No

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

coronary artery: the artery that branches from the aorta to supply blood to the heart
artery: a blood vessel that carries blood from the heart to the body

Other hypernyms of coronary artery include arteria, arterial blood vessel.

coronary artery (noun)	artery (noun)
the artery that branches from the aorta to supply blood to the heart	a major thoroughfare that bears important traffic
	a blood vessel that carries blood from the heart to the body