Afghan vs Kafir

Afghan and Kafir both are nouns.

Word	Noun	Adjective	Verb	Adverb
Afghan	Yes	Yes	No	No
Kafir	Yes	No	No	No

As nouns, Kafir is a hyponym of Afghan; that is, Kafir is a word with a more specific, narrower meaning than Afghan:

Other hyponyms of Afghan include Pashtoon, Pashtun, Pathan, Pushtun.

Afghan (noun)	Kafir (noun)
tall graceful breed of hound with a long silky coat; native to the Near East	a member of the Kafir people in northeastern Afghanistan
an Iranian language spoken in Afghanistan and Pakistan; the official language of Afghanistan
a native or inhabitant of Afghanistan

Afghan (adjective)	Kafir (adjective)
of or relating to or characteristic of Afghanistan or its people