Irish potato vs tater

Irish potato and tater both are nouns.

Word	Noun	Adjective	Verb	Adverb
Irish potato	Yes	No	No	No
tater	Yes	No	No	No

As nouns, Irish potato and tater are synonyms defined as:

Irish potato and tater: an edible tuber native to South America; a staple food of Ireland

Other synonyms of Irish potato include murphy, potato, spud, white potato.

Irish potato (noun)	tater (noun)
an edible tuber native to South America; a staple food of Ireland	an edible tuber native to South America; a staple food of Ireland