Afghan vs Asian

Afghan and Asian both are nouns.

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

As nouns, Asian is a hypernym of Afghan; that is, Asian is a word with a broader meaning than Afghan:

Other hypernyms of Afghan include Asiatic.

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

Afghan (adjective)	Asian (adjective)
of or relating to or characteristic of Afghanistan or its people	of or relating to or characteristic of Asia or the peoples of Asia or their languages or culture