pneumatic tire vs pneumatic tyre

pneumatic tire and pneumatic tyre both are nouns.

Word	Noun	Adjective	Verb	Adverb
pneumatic tire	Yes	No	No	No
pneumatic tyre	Yes	No	No	No

As nouns, pneumatic tire and pneumatic tyre are synonyms defined as:

pneumatic tire and pneumatic tyre: a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc

pneumatic tire (noun)	pneumatic tyre (noun)
a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc	a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc