Drone

A pilotless aircraft operated by remote control.
But also:
1. A male bee, especially a honeybee, that is characteristically stingless, performs no work, and produces no honey. Its only function is to mate with the queen bee.

2. An idle person who lives off others; a loafer.

3. A person who does tedious or menial work; a drudge.

4. A continuous low humming or buzzing sound.

5. Music

a. Any of the pipes of a bagpipe that lack finger holes and produce a single tone.

b. A long sustained tone.

c. Any of various instruments that produce only a constant pitch.

A PWO?