Yes, drone is a Scrabble word!

Verb

1. Make a monotonous low dull sound

2. Talk in a monotonous voice

Noun

1. Stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen

2. An unchanging intonation

3. Someone who takes more time than necessary; someone who lags behind

4. An aircraft without a pilot that is operated by remote control

5. A pipe of the bagpipe that is tuned to produce a single continuous tone