Noun bun has 1 sense
  1. bun, roll - small rounded bread either plain or sweet
    --1 is a kind of bread, breadstuff, staff of life
    --1 has particulars:
     tea bread; frankfurter bun, hotdog bun; hamburger bun, hamburger roll; brioche; crescent roll, croissant; hard roll, Vienna roll; soft roll; kaiser roll; Parker House roll; clover-leaf roll; onion roll; sweet roll, coffee roll; bagel, beigel
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