WordNet (r) 3.0 (2006):

popover
    n 1: light hollow muffin made of a puff batter (individual
         Yorkshire pudding) baked in a deep muffin cup

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "popover":
   Danish, Danish pastry, English muffin, Parker House roll,
   Yorkshire pudding, bagel, bialy, bialystoker, bun,
   clover-leaf roll, coffee cake, crescent roll, croissant, cross bun,
   crumpet, gem, hard roll, hot cross bun, kaiser roll, muffin,
   onion roll, pinwheel roll, roll, scone, soft roll