conveyer vs messenger

conveyer and messenger both are nouns.

Word	Noun	Adjective	Verb	Adverb
conveyer	Yes	No	No	No
messenger	Yes	No	No	No

As nouns, messenger is a hypernym of conveyer; that is, messenger is a word with a broader meaning than conveyer:

Other hypernyms of conveyer include courier.

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