foreigner vs traveler

foreigner and traveler both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreigner	Yes	No	No	No
traveler	Yes	No	No	No

As nouns, traveler is a hypernym of foreigner; that is, traveler is a word with a broader meaning than foreigner:

foreigner: a person who comes from a foreign country; someone who does not owe allegiance to your country
traveler: a person who changes location

Other hypernyms of foreigner include traveller.

foreigner (noun)	traveler (noun)
a person who comes from a foreign country; someone who does not owe allegiance to your country	a person who changes location
someone who is excluded from or is not a member of a group