traveller vs doer

traveller and doer both are nouns.

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

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

Other hypernyms of traveller include actor, worker.

traveller (noun)	doer (noun)
a person who changes location	a person who acts and gets things done