car tire vs automobile tire

car tire and automobile tire both are nouns.

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

As nouns, car tire and automobile tire are synonyms defined as:

car tire and automobile tire: a tire consisting of a rubber ring around the rim of an automobile wheel

Other synonyms of car tire include auto tire, rubber tire.

car tire (noun)	automobile tire (noun)
a tire consisting of a rubber ring around the rim of an automobile wheel	a tire consisting of a rubber ring around the rim of an automobile wheel