thoroughfare vs artery

thoroughfare and artery both are nouns.

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

As nouns, artery is a hyponym of thoroughfare; that is, artery is a word with a more specific, narrower meaning than thoroughfare:

Other hyponyms of thoroughfare include blind alley, cul de sac, dead-end street, impasse, street, street.

thoroughfare (noun)	artery (noun)
a public road from one place to another	a major thoroughfare that bears important traffic
	a blood vessel that carries blood from the heart to the body