nation vs Irish

nation and Irish both are nouns.

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

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

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

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