Sinhalese vs Asiatic

Sinhalese and Asiatic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sinhalese	Yes	Yes	No	No
Asiatic	Yes	Yes	No	No

As nouns, Asiatic is a hypernym of Sinhalese; that is, Asiatic is a word with a broader meaning than Sinhalese:

Other hypernyms of Sinhalese include Asian.

Sinhalese (noun)	Asiatic (noun)
the Indic language spoken by the people of Sri Lanka	a native or inhabitant of Asia
of an ethnic group native to Sri Lanka

Sinhalese (adjective)	Asiatic (adjective)
of or relating to the Sinhalese people	of or relating to or characteristic of Asia or the peoples of Asia or their languages or culture
of or relating to the Sinhalese languages