n. 25B6; verb
a plane droned overhead : HUM, buzz, whirr, vibrate, murmur, rumble, purr.
he droned on about right and wrong : SPEAK BORINGLY, go on and on, talk at length; intone, pontificate; informal spout, sound off, jaw, spiel, speechify.
25B6; noun
the drone of aircraft taking off : HUM, buzz, whirr, vibration, murmur, purr.
drones supported by taxpayers' money : HANGER-ON, parasite, leech, passenger; idler, loafer, layabout, good-for-nothing, do-nothing; informal lazybones, scrounger, sponger, cadger, freeloader, bloodsucker, waster, slacker.