tyre vs pneumatic tire

tyre and pneumatic tire both are nouns.

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

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

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

Other hyponyms of tyre include auto tire, automobile tire, car tire, rubber tire, pneumatic tyre, wagon tire.

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