Irish vs nation

Irish and nation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Irish	Yes	Yes	No	No
nation	Yes	No	No	No

As nouns, nation is a hypernym of Irish; that is, nation is a word with a broader meaning than Irish:

Other hypernyms of Irish include country, land.

Irish (noun)	nation (noun)
the Celtic language of Ireland	a politically organized body of people under a single government
whiskey made in Ireland chiefly from barley	the people who live in a nation or country
people of Ireland or of Irish extraction	a federation of tribes (especially Native American tribes)

Irish (adjective)	nation (adjective)
of or relating to or characteristic of Ireland or its people