automobile tire vs car tire

automobile tire and car tire both are nouns.

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

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

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

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

automobile tire (noun)	car 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