Bangladeshi vs Asian

Bangladeshi and Asian both are nouns.

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

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

Other hypernyms of Bangladeshi include Asiatic.

Bangladeshi (noun)	Asian (noun)
a native or inhabitant of Bangladesh	a native or inhabitant of Asia

Bangladeshi (adjective)	Asian (adjective)
of or relating to or characteristic of Bangladesh or its people or language	of or relating to or characteristic of Asia or the peoples of Asia or their languages or culture