tumbler

Tumbler has 2 syllables: tum · bler.

noun. Pigeon that executes backward somersaults in flight or on the ground.

noun. A glass with a flat bottom but no handle or stem; originally had a round bottom.

noun. A gymnast who performs rolls and somersaults and twists etc.

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