conveyor vs courier

conveyor and courier both are nouns.

Word	Noun	Adjective	Verb	Adverb
conveyor	Yes	No	No	No
courier	Yes	No	No	No

As nouns, courier is a hypernym of conveyor; that is, courier is a word with a broader meaning than conveyor:

Other hypernyms of conveyor include messenger.

conveyor (noun)	courier (noun)
a moving belt that transports objects (as in a factory)	a person who carries a message
a person who conveys (carries or transmits)