WordNet (r) 3.0 (2006):

tater
    n 1: an edible tuber native to South America; a staple food of
         Ireland [syn: potato, white potato, Irish potato,
         murphy, spud, tater]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "tater":
   Irish potato, Kraut, aubergine, beans, cabbage, eggplant, greens,
   legumes, love apple, mad apple, pieplant, potato, potherbs,
   produce, rhubarb, spud, tomato, vegetables, white potato