car tire vs retread

car tire and retread both are nouns.

Word	Noun	Adjective	Verb	Adverb
car tire	Yes	No	No	No
retread	Yes	No	Yes	No

As nouns, retread is a hyponym of car tire; that is, retread is a word with a more specific, narrower meaning than car tire:

car tire: a tire consisting of a rubber ring around the rim of an automobile wheel
retread: a used automobile tire that has been remolded to give it new treads

Other hyponyms of car tire include recap.

car tire (noun)	retread (noun)
a tire consisting of a rubber ring around the rim of an automobile wheel	a used automobile tire that has been remolded to give it new treads

car tire (verb)	retread (verb)
	give new treads to (a tire)
	use again in altered form