WordRel.com

• pigeon that executes backward somersaults in flight or on the ground

  synonym	rollertumbler pigeon
  derivation	tumble
  hypernym	domestic pigeon

• a glass with a flat bottom but no handle or stem; originally had a round bottom

  hypernym

  drinking glassglass

• a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown

  derivation	tumble
  holo part	lock
  hypernym	impedimentimpedimentaobstructerobstructionobstructor
  hyponym	leverlever tumblerpinpin tumbler

• a gymnast who performs rolls and somersaults and twists etc.

  derivation	tumble
  hypernym	gymnast
  hyponym	turner