drone vs pitch contour

drone and pitch contour both are nouns.

Word	Noun	Adjective	Verb	Adverb
drone	Yes	No	Yes	No
pitch contour	Yes	No	No	No

As nouns, pitch contour is a hypernym of drone; that is, pitch contour is a word with a broader meaning than drone:

Other hypernyms of drone include intonation, modulation.

drone (noun)	pitch contour (noun)
stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen	rise and fall of the voice pitch
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)	pitch contour (verb)
talk in a monotonous voice
make a monotonous low dull sound