bearer vs traveller

bearer and traveller both are nouns.

Word	Noun	Adjective	Verb	Adverb
bearer	Yes	No	No	No
traveller	Yes	No	No	No

As nouns, traveller is a hypernym of bearer; that is, traveller is a word with a broader meaning than bearer:

Other hypernyms of bearer include traveler.

bearer (noun)	traveller (noun)
a messenger who bears or presents	a person who changes location
one of the mourners carrying the coffin at a funeral
the person who is in possession of a check or note or bond or document of title that is endorsed to him or to whoever holds it
someone whose employment involves carrying something