MEANING: noun:
1. An informer.
2. In cricket, a bowler, especially a slow bowler.
3. A float for a fishing line.
4. A large marble.

ETYMOLOGY: For 1, 2: From dob (to inform, to put down, to throw).
For 3: From Dutch dobber (float, cork).
For 4: From dob, a variant of dab (lump).
Earliest documented use: 1836.

DOUBER - what to do when you need to get somewhere in NYC and you don't have a car

DOBER - familiar form of an allegedly vicious breed of dog

ADOBBER - someone who erects Pueblo-style homes (or Hopi or Zuni, if you like)