drone vs loiterer

drone and loiterer both are nouns.

Word	Noun	Adjective	Verb	Adverb
drone	Yes	No	Yes	No
loiterer	Yes	No	No	No

As nouns, loiterer is a hyponym of drone; that is, loiterer is a word with a more specific, narrower meaning than drone:

drone (noun)	loiterer (noun)
stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen	someone who lingers aimlessly in or about a place
a pipe of the bagpipe that is tuned to produce a single continuous tone
an aircraft without a pilot that is operated by remote control
an unchanging intonation
someone who takes more time than necessary; someone who lags behind

drone (verb)	loiterer (verb)
talk in a monotonous voice
make a monotonous low dull sound