Nouns

(n)dronestingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen
(n)monotone, drone, droningan unchanging intonation
(n)dawdler, drone, laggard, lagger, trailer, pokesomeone who takes more time than necessary; someone who lags behind
(n)drone, pilotless aircraft, radio-controlled aircraftan aircraft without a pilot that is operated by remote control
(n)drone, drone pipe, bourdona pipe of the bagpipe that is tuned to produce a single continuous tone

Verbs

(v)dronemake a monotonous low dull sound“The harmonium was droning on”
(v)drone, drone ontalk in a monotonous voice